Just found out that my GF is a whore

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We were dating for 2 months. She's from 300 miles away, studying in my city. She gave me the login and password from her social network long time ago. After a recent fight she changed the pass. I tried a couple of similar passwords I succeeded - found out she's dating another guy. I was shocked. So all the time when she told me that it's her mom that calls her and demands her to be at home at 9 pm - it was actually him. It was him who called during our sex so she jumped off me and talked to him, telling me that it's her mom. Jesus
So I was just an affair in this city so she won't be too bored here. But for big plans she has another guy. Honestly she was surprised of my reaction like what did you expect? I'm having sex with you so it's obvious that it's just an affair, if I wanted something serious I'd act accordingly. that guy told me that he didn't even hold her hand for the whole year of dating. Let me explain - there is a tradition in our ethnic group - if a decent girl dates a guy she shouldn't even let him kiss or hold hand - only after marriage.
I tried to msg him via the same social network but she has a login+password of his account and she blocked me from there, then she deleted her own account. I contacted to one of his friends on that social network service. I got his phone number and send him an SMS with short description. He called me back and we talked. He asked about everything, didn't question any of what I said and he was pretty friendly even though he was shocked. He said that she denied everything at first but then started telling things. But she still denies that we had sex, she only admitted that we had oral sex - I did for her. Her brothers are very close friends of him so he's very mad and wants to let the brothers know - he wants to come to my city with them and ask her about everything in front of me and also wants to see if I can repeat my story in front of her. I have a feeling that they just want to beat the shit out of me. What do I do?