I've been down this road with one of his other ex's. When my relationship was new, I felt insecure and paranoid about the ex's. I am now more secure with my relationship, but I truly dislike being around his ex's because my first instinct is to let my diamond do the talking. And my diamond says, "there's a reason why I'm on this hand and not yours". My boyfriend doesn't like to be the bad guy, but his other ex left us alone after she saw my ring. I told him that I don't like being put in that position, but he thinks it's all just a coincidence that his ex's finally give up after I show them my ring.
So my original point is not that I distrust my boyfriend, it is a distrust of the women that want to spend time with their non-available ex's.
Can women really be just friends with the ex boyfriends that didn't want to marry them?

