my FP (lover) is pretty popular and also gets along well with other girls. but i hate it so much. i'm really really jealous and i seriously don't know how i should be able to accept those female friends. in the past, i was in a relationship with a NPD. he lied to me, cheated on me and replaced me so many times (it was an on/off relationship and unfortunately, i took him back too often because he manipulated me into thinking he changed or wants to change). anyway, my trust issues have gotten so bad due to this. i instantly feel endangered when my FP just snapchats a girl. he doesn't ever meet up alone with one girl or anything, but it still bothers me. even if he's also with a few male friends. he always assures me that he hasn't ever even thought about having anything else than a friendship with those girls and that i'm the only one he wants. but idc. i obsess way too much about these women and i know it's not ok. to me, he's just so perfect and he's so good looking and i can't imagine that those girls aren't attracted to him (he hangs out with girls that are exactly into the same things like him - weed, lil peep etc. pretty edgy haha but yeah). also i just can't imagine that a guy and a girl can stay just friends. i mean, it's kinda paradox because i also have a lot of male friends but it's like, i know my intentions. i don't know other people's intentions tho. i can't rely on anyone else

this whole thing is damaging my "relationship"* pretty bad and i don't know what to do about it..

*we aren't really in a relationship yet. he wants this to really work out and only get in a relationship when there's this certainly that it will last - basically when i get better mentally (and him as well, he might be bipolar). which actually bothers me a lot.. i've talked to him about it but idk we haven't met up irl since then.

has anyone else experienced this and has some tips on how to cope?