How do I prove myself so my girlfriend will believe me?

cieci
My girlfriend heard about a few girls I was seeing before we went out. She swears I slept with them, but I know differently because nothing ever happened sexually. Even though this happened before our relationship she still tells me she does not trust me. She is a very attractive 38 year old woman, and I've been told we make a great looking couple. I am 38 myself and we have been dating a year now. So how do I handle this? It seems like we can't move forward in our relationship if she can't get past this.
How do I prove myself so my girlfriend will believe me?
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