Only change I’ve encountered personally was with an ex who became very physically distant. Not only less sexual, but just put off from physical contact with me entirely. I remember one time I went to give her a hug and she wiggled away from it, so I asked what’s wrong and why she’d been acting that way and her exact words were “When you’re affectionate with me I’m worried you’re going to try to initiate sex.” Like... god forbid I want to kiss and caress my girlfriend, why should that be cause for worry? We’d never had any issues with consent or libido or anything like that before, but once we started having other (in my mind unrelated) relationship problems she stopped seeing me in a sexual light entirely. And that wound up being the big issue that I couldn’t recover from.

I found myself having to hold myself back from admiring my own partner. Like she’d be changing clothes or getting out of the shower and I’d think to myself “Don’t look at her tits, don’t look at her ass, keep it together, eyes forward, think unsexy thoughts.” As if she were just my platonic roommate and not my lover. Well, eventually it worked and I’d talked myself out of my attraction to her. I’d just come home and tend to a hobby or something because I didn’t want to be reminded that we used to so passionately in love. That’s when I knew it was over.