Geting an email from someone saying your partner is cheating

I'm in a bad situation. I received an email from a person I don't know telling me my fiancé is cheating on me. It hit me like a wall of bricks. I immediate asked him about it. The email was a girl saying he spent the night with his ex girlfriend, (insert name). I had never heard of this girl. As soon as I said the name he said I know who this. Long story short...before he dated me he apparently had a stalker. He has showed me emails she sent him back in 2011 begging for him back, had other people (including my cousin) say that she would come by the house and his work wanting to talk to him. I get that some people act crazy when a relationship ends...but why wait until now to contact me to get revenge on him? He and I have had many fights about this. He feels I'm believing a stranger over him. I just don't know why someone would make this up. I wrote back an email to her telling her that ive heard from several people she is unstable and she had better back off. she of course wrote back saying it again and then went on and on about how when he broke up with her he cut off all communication, didn't handle it maturely. So what?? what does that have to do with me? He said he never told me about her because he figured i'd head for the hills if he told me he had dating situation where the person would not leave him alone. I want to believe him, but this is so weird. I tend to be a paranoid person already about everything. My family members don't think he did this...obviously his don't either. I did not respond to her again and he said he has not either and that all she wants is a response. I don't feel like I even trust her enough to ask her for more proof.

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