Not to post identifying information online, "work", "the house keeps developing major problems including (but not limited to) something that was supposed to be a six-week job starting in mid-January and is still ongoing", "there's a global pandemic".
I think I'm not expressing myself clearly - I absolutely would not say that true intimacy or love are missing, or that I don't like lustful sex. What I'm trying to say is that, for me, there are two kinds of sex: "lustful" sex and "loving" sex. The former is fickle and comes only when it wants to. The latter is all about love and emotional intimacy and cuddling afterwards (for me) but I'm only doing it because somebody asked me to.
I think a fair analogy is "eating quiche". I used to be really into quiche but then life happened and now I'm not in the mood for it so often. My husband still really likes quiche and would like to be eating it 2-3 times a week. I'm content enough to eat it that often, and I enjoy it well enough when it's in front of me, but I wouldn't have chosen to eat it and my husband can tell.
Again, identifying information, but the short answer is "my family imploded spectacularly a year and a half into my undergrad degree". The sex actually got better in a "per occasion" sense after that, but the frequency never recovered from the ongoing stress of depression/sudden financial issues/trying not to fail my degree/then-undiagnosed learning difficulty, and it slowly tapered off. There were some "rallies" when things got better for a while, but they didn't stick, not least because by then we were very much in the dynamic of "I want it less often than it's happening".
There are absolutely things, at this point, that need to be talked through with a shrink. That's why we're not asking y'all "how do we solve our sex life"! We're asking "how do we replace it without nuking our emotional life".