My Girlfriend has been with a number of sexual partners, and it's playing on my mind?

Anonymous
I've been seeing this girl since mid October and she says we're basically official (but we're not rushing things). I have known this girl for about 2 years and in the past I've given her a lot of advice about her partners whilst not having feelings for her at all, which meant I was never really bias. Then it started to happen, we got with each other of a night out and things escalated. I could tell she was starting to like me and because of this I started to like her back. We slept with each other in September and then in October decided to give it a go. The thing is, I'm struggling with her past. Obviously being her previous best friend she has asked me a lot of questions and told me a lot of things I wish I never heard. I haven't had as many sexual partners as her so it's really playing on my mind. The fact that she has enjoyed things (not just sex) with other people, sometimes even my friends, is starting to get to me. She still actively hangs out with one of the people she slept with a couple of times, and considers him a really good friend. On multiple occasions she told me he was the one she loved, but he got a girlfriend shortly after and is still dating her I think. I feel like I'm the alternative in all of this and it's really starting to frustrate me. I want to talk to her about it but whenever I mention one of her ex partners she gets upsets because it makes her feel bad (which is really patronising). How do I deal with this?
My Girlfriend has been with a number of sexual partners, and it's playing on my mind?
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