I have a problem with my girlfriends previous promiscuity in first year

Hi TSR, Basically I've been with my current girlfriend since the start of second year and our relationship so far has been awesome. A few weeks ago we had a conversation about our sexual histories as she was really curious about it for some reason. She was a virgin when she first came to uni, whereas I had only had sex with 1 person who I was with for about a year. She told me that in first year she had slept with close to 30 different guys. She also talked about how she had a competition with her friends during freshers where they would sleep with blokes of different sizes and ethnicities (e.g small asian guy, big black guy and so on). Personally I only have sex when I'm in a relationship with people I genuinely liked. I wasn't expecting her to be the same as me but I certainly wasn't expecting this. In fact I find it repulsive, and if I knew this before I fell for her I probably wouldn't have entered a relationship with her. I tried to act like I wasn't bother by it when she told me about it and to this day she has no idea that I feel this way about it. Now I can't get the thought of constantly seeing her previous conquests on nights out. I've also begun to notice that she acts really strange ushering me away from a group of guys that she recognises and making us take a different route to the bar. Her own sexual history nether really crossed my mind before she brought it up. But now that she's openly told me this I can't help but feel repulsed to the point where I do look at her differently now. Despite this I really love her to bits (she feels the same about me). Some of you might think I'm being stupid about it but its really bothering me and I dunno know how to get past it. I'm scared that this might destroy the wonderful relationship we had up until this point :( Any advice would be much appreciated Thanks

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