Ah~ I hate jealousy. When I first started dating my boyfriend, I was very jealous of the girl he used to like. He liked her for 3 years, but he never dated her because he basically lost his opportunity with her.

I was a bit jealous of her because at one point me and my boyfriend broke up because he wasn't sure if this relationship was what he wanted. So, he tried going after her and I tried to support him. I was okay with it at first but after a while I got really really jealous and I wouldn't help him anymore.

To keep a long story short, it didn't work out, he thought things over for a while and decided that he was at his happiest with me, so we got back together. I was very insecure when we got back together though. I thought "am I not as good as her?" and I thought that maybe I should be more like her and maybe he'll like me more then and I won't have to worry about him leaving me. When I told him this he said:

"I don't want another her and I wouldn't want another you either. I'm with you because I love you as you are, not because you're similar to her."

He said some other stuff too but it's a bit more of suited to our situation lol. But really, talk to him and tell him you're bothered by this. Obviously his ex is a little salty because she can't have the man she wants.

(for the record the two of us don't count the time we were broken up so that makes us together for 2 years now lol)