Should I take him back?

I dated this guy for about 1 year. We hit it off REALLY quickly. We ended up getting pretty serious pretty quick. I'm the type of person who is up for anything and believe in giving second chances but am REALLY confused. My ex's friend told me he had cheated on me at one of his shows (my ex is in a band). I got all upset, infidelity is the only thing that is a deal breaker. He denies that anything happened...its hard to believe though because he's slept with 25 women before me. Do I believe him and feel like a crazy woman or ditch him?
Updates:
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I took him back. 2 days ago. He claimed he didn't do it. I need to get over my fears of infidelity. The reasons for my suspicions in every woman in my family has been cheated on. Including myself. Its hard not to jump to conclusions.
Should I take him back?
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