<human>: So, I started this relationship as just casual sex after a break up. It turned into something unexpected and I realized this girl was someone I really liked. 

A month later we are living together and I discover she has been with somewhere around 100 dudes (she lost count if the exact number) anyways she did all this bdsm stuff, pegging, blood play. And some stuff she wont even tell me about. I also learned she mostly met dudes in dating sites and picked them up in bars. She also told me at a point she had thought about becoming a escort 

I was no virgin but, I have only slept with 10 or so peopl and 90 percent of them were serious relationships. This info about here past is just wrecking my mind. I think about her past when something similar is brought up in convo or in tv. I think about all those encounters almost everytime 
I look at her. 

I dont know what to do or how to feel. But, I am super torn up about it and I really need some advice.

Could you distill the essence of the text into 1-3 sentences?
<bot>: I found out my girlfriend has slept with close to 100 men in the 2 years before we met. It really upsets me what should I do?