I'm looking for a certain manga I read a while ago.

I believe it was about a female protagonist who wishes she wasn't born, and so she starts to be forgotten by her friends and family, (I think there might be a scene where she goes home and her parents think she's an intruder?). It turns out that one person does remember who she is, and it's a boy from her school. He remembers her and doesn't believe that anyone else has forgotten but they confirm that she has been erased from their memories.

Skip forward a few chapters, they end up living together but they both know that eventually he'll wake up and won't remember who she is, so they enjoy their time together.

They wake up one morning and he believes he passed out from alcohol and had a one night stand, (It's possible he's a playboy-type of guy), so it's confirmed that he has forgotten who she is.

She packs up all her stuff from his apartment and leaves. This is all I can remember from the manga, if anyone can be of any help I'd be extremely thankful. ^^

I have read a manga named: half&half
long ago which as long as i remember similar to what you described even if it wasn't the same you most likely would enjoy half&half.