How can I get over not trusting my girlfriend because she cheated on her ex?

Ive been dating this girl for a little while now and I cant seem to get over her sexual past. Before her I had only had sex once, she however had 8 partners before me. The most troubling part is that she cheated on her ex boyfriend 5 times. they dated for a year right before her and I. I was one of those 5 however I am the only one she didnt sleep with. The whole situation causes trust and insecurity issues on my part. She is bothered by it because she says shes a completely different person. I believe her and If it werent for her telling me about her past I would have never had any issues dealing with trust. I love her, but it’s hurting the both of us… suggestions?

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