How do I become less forgettable?

I feel like I have no real value in the world and all the relationships I’ve had of any type feel very one sided and yet when I leave a toxic situation I’m left thinking about then but it seems like I’m basically dead to them even if I don’t really ever doing anything to warrant them not liking me (it’s possible I just have never done anything to intentionally cause pain bc I’m a people pleaser to a fault). I gave up my entire life and identity to be with my ex and I gave up my home and friends to be with him and he still dropped me for a literal pair of boobs (doesn’t make sense cause he has been notoriously a ass man and not to brag but I’ve been told I have porn boobs so like wahhh) why do people do these things. Why am I just the type of person people don’t even care to remember or think about. Sorry I’m hormonal and having a pity party. :))))