I think there are a lot of partners out there (including where both are EA, but one is maximizing harder than the other) who feel similarly! 
Another relevant post: You have more than one goal, and that's fine

I shared this post with my non-EA husband and asked for his views. He said he thinks all couples have some values that are different from each other, and that he feels like he supports me being involved in EA and I support him in his goals (I thought that was very sweet).

Sorry I can't be of more help on relevant articles or support, but thought you might be interested in another answer on the first two questions!

You seem really thoughtful and considerate.

This isn’t really that deep, but it seems like EAs should accommodate the needs of their partners, with good communication, and investment appropriate to the relationship that they want for each other.

I don’t think this is news to anyone. I think I’m trying to say your feelings and views are valid.

A c0uple of thoughts and I am happy to expand further. 

First, I like 80k's framing of EA as a career. This means that you as a family probably do not want EA values to affect family decision making too heavily, much like a banker would not charge high consumption loan interest  to her spouse if she paid for their coffee. I think my partner feels similarly to you and I frame my EA engagements as work. This means that when it becomes time to help around the house, I leave my work after a reasonable number of hours spent and become a "non-EA family member" instead.

Secondly, and as I think others who commented here alludes to, if your partner is "deep EA", he would actually really invest in your well-being and be very cautious to jeopardize the relationship by bringing "work" into it. This is because in EA we are playing the long game, we have an ambition to spend all 80k hours of our careers effectively doing work, year after year. And this requires a foundation that lets us do this consistently and at high quality, and for me this foundation consists of:

-Family and friends

-Mental health

-Sleep

-Physical health

-Sound personal finances

And I listed family and friends on top, because having their support, especially during hard times, is for many of us a great source of strength.

My partner and I also go to what we call "preventative family counselling" - it is not a bad idea to just go and see someone quite early on, before there is perhaps "something" to talk about.

Increasingly I find myself in a position where I feel that I have to defend myself to my significant other for actions

These discussions and  family-research-moments ... are increasingly eating into my self-worth and feeding insecurities.

This may be wildly off, but: have you talked to your partner about this? Do they know that when they talk to you like this, you feel attacked? And that it affects your self-worth? What would they say?

I ask because I think this is in many ways a relationship problem. They are doing something that makes you feel hurt. That's a problem that you could resolve in a number of ways - they could change, you could change, but you need to talk about it.

It might be that the outcome of that conversation is that you decide that you want to be more okay with thinking in this way, or shifting closer to what they believe. And maybe that's already where you are (in which case my apologies). But I don't think you should start out assuming that it's you who needs to change here.

My spouse and I are both heavily involved with EA, but we nevertheless have significant differences in our philosophies. My spouse's world view is pretty much a central example of EA: impartiality, utilitarianism et cetera. On the other hand, I assign far greater weight to helping people who are close to me compared to helping random strangers^[1]. Importantly, we know that we have value differences, we accept it, and we are consciously working towards solutions that are aimed to benefit both of our value systems, with some fair balance between the two. This is also reflected in our marriage vows.

I think that the critical thing is that your SO accepts that:

• It is fine to have value differences.
• They should be considerate of your values (and you should be considerate of their values, ofc). Both systems have to be taken into account when making decisions.
• There is no "objective" standard s.t. they can "prove" their own values to be "better" according to that standard and you would have to accept it.
• You don't need to justify your values. They are valid as is, without any justification.

If your SO cannot concede that much, it's a problem IMO. A healthy relationship is built on a commitment to each other, not on a commitment to some abstract philosophy. Philosophies enters it only inasmuch as they are important to each of you.

1. ^{^}

   That said, I also accept considerations of the form "help X (at considerable cost) if they would have used similar reasoning to decide whether to help you if the roles were reversed".

Perhaps helpful: a few years ago Hidden Brain did an episode on my marriage and how my wife (who is a lovely, ethical person, but doesn't identify as EA and has some significant disagreements with some EA ideas) and I (an EA trying his best who's also wrong sometimes) get along. Obviously we're just one couple so our discussions/tensions may not be representative, but I thought Shankar Vedantam and the producer, Rhaina Cohen, did a fantastic job. 

In my experience, EA is a somewhat dangerous philosophy because it's emotionally hard to keep one's eyes open to the problems of the world, while understanding what's possible to do about it, while also trying to understand one's own limitations. So mental health is something EAs struggle with a lot, but I think there are some misunderstandings that make it worse.

1. Understand that, yes, indeed, we live in triage every second of every day. That's just unfortunately the world we live in.
2. But being good does not mean you have to try to suffer in accordance with how much suffering there is in the world just to be "fair". If you want to do something about the world, it seems good to try to cultivate a sense of compassion that feels serene, positive, and beautifwl. Not because suffering is good, but because a willingness to try to help is.
3. And while I do advocate being ambitious as a way to do more good, it's possible to be ambitious while emotionally accepting that we can't rescue everyone. Something like first choosing to be ok, and then increment our happiness with every additional being we help, rather than choosing to be not ok until we've helped everyone.

But my keys won't fit into other people's locks, so I hope you find whatever works for you. : )

Ozy wrote a great post about the being a more and less dedicated EAs.