i'm fine with her having additional partners; there's a combination of things in this particular situation that are making things difficult. she's affectionate, to the point of being intimate, with so many people, and doesn't make a super big distinction between 'definitely non-platonic friends' and...

for a while i've feeling bad about relationship with A, who i'm in a long-distance polyam relationship with. i feel invalidated because A is 18 and i'm around 3 months from that right now (she's six months older than me). it hasn't been an issue until now, because A hasn't been sexually active, but ...