@Kaarme
I don't think it's a trick, he seems to be at least not trying to hit on them considering he's already in a relationship with eve, it's probably just him not being interested tends to attract girls around him (if reincarnation shenanigans isn't going on here, which for all we know it might), sadly this is a common and true trope of girls that age, they like the mysterious, uninterested boy, hence why stuff like twilight was popular.