<human>: I met this girl K a year ago and in February we started off as fuck buddies. We live in different cities, she lives in my hometown, but I am home often. After a while we started developing feelings for eachothers, but she is moving after the summer so we just kept going as fuckbuddies. In April we broke it off for a week because she was worried about getting too involved. After this week she started texting me again and we decided to give to start dating. 

Things have been going really well, this weekend she came to visit me and it was great. The problem is that K had slept with a friend of mine about a year ago, M. M currently is in a long distance relationship. 

The week in April where we "broke up" she was on an afterparty with M and a couple of other friends, they ended up sleeping together, she told me nothing happened. While drinking on Saturday she told me that he started touching her but she ended it and they went to sleep. I got a bit upset about this and she suddently got really silent, I am not the jealous type at all and I believe she got supriesed by my reaction. Then after a while she told me that what really happened is that she gave him a blowjob, but nothing more happened since she was on her period. 

I am not sure what i should do, I really like her and enjoy the time we spend together. Also she did this while she thought we both thought we were through, but it is really annoying me. So relationship_advise do you have any suggestions in what I should do?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Broke up with my fuckbuddy and she blew a friend of mine then after a week we started talking again and started dating, me unknowing of what happened that week.