<human>: I had been seeing my girlfriend for about a year, before I received a competitive fellowship to work/study for a year in East Asia. Due to the prestigious nature of this fellowship, my girlfriend pushed me to go aborad while she stayed in America to get her Master's. We decided a LDR may be too difficult, so we "broke up" at its onset last Summer. Although we were no longer together officially, we still acted like we were in a relationship. We said "I love you" constantly, had Skype sex, and talked daily. Due to having feelings for her, I never pursued other women, and I expressed that if she started seeing another man it would be hard for me, though allowable. 

Fast-forward to six months later. I miss her so much that I booked a plane ticket home to see her for 2 weeks. We were obviously excited about this, but she just informed me that while I was in Asia she had drunken sex with random men she met at a bar. Intellectually, I understand that this was allowable as we weren't 'officially' dating, though emotionally I can't help but feel angry, jealous and a little betrayed. She seems sorry, and I believe her. I dont want to lose her, but I'm looking for some advice to help but things in perspective. I dont want to be so angry when I get to see her for the first time in months.

Can you summarize the given text in a few sentences?
<bot>: Went abroad for 6 months. GF and I broke up but still acted romantically involved. She had drunken one night stand and I feel angry. Need advice.