Honestly is there a guy out there that does not mind about his girl friends past at all?

I knew my girl friend through one of my guy friends who is really trusty and when he introduced her to me. He told me that she is very easy but did not say anything else and I did not ask what he meant either. 8 months later I felt that I am falling in love. Then she asked me about the past and I told that I had three relationships and I explained why each ended. She told me she had three relationship one of which was just for . Then she told me that she made out with (20+) people (make out includes hand jobs and..). this really bothered me as I start to realize what my friend meant about her being easy. I did not say anything to my girl friend as I was ashamed about what I started to think about her. Few days ago I saw an email from one of her guy friends (her childhood friend) who is married and is in a different country. He was talking about how he played doctor and nurse with my girl friend when they were young. I am feeling so depressed now. Am I just closed minded? I am a highly educated person (I have PhD in engineering) I am not sure why I think like this. I have a lot of bothering thoughts in my head. I tried to talk to my girl friend once but she said that I should accept her for who she is and showed extreme anger talking about this issue. I know it is not her fault but I do not know how to get over these things as they happen day in day out.