I know in past relationships, I’ve done this and it’s a real problem.
Like sometimes you squish bits of yourself in on yourself to make room for your partner, and if you keep on doing that, sometimes they just get more and more used to being accommodated and your partner starts to think “if they’ll give up so much to keep the peace they must not mind/must not be any good” and they keep asking you to squish yourself more and more until eventually they ask you to squish down some part of you you can’t squish and you can’t and by that time they’re so used to you being moldable to their needs that the whole thing breaks down