My boyfriend's ex girlfriend can't get over him?

I've been with my boyfriend for just over a year. We have a wonderful relationship, and everything is perfect, except when it comes to his ex girlfriend. They were only together for five months, and he broke up with her about two years ago, but she can't get over him. She lives in another city, and the two of them talk casually over e-mail. He's even said he wants to hang out with her, just as friends, which I can understand. I love my boyfriend and trust him completely, but he doesn't realize that his ex still isn't over him. She's told me she still wants to be with him and that she'll always love him. He, on the other hand, refuses to believe this. He says she's gotten over him by now and that I'm just crazy. We always end up getting in an argument over it. I know I can't make him believe me, but what should I do in this situation? For one, I feel sorry for the girl. Secondly, I don't want her affecting this relationship anymore. Advice?
My boyfriend's ex girlfriend can't get over him?
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