A story of a young adult... (need comments please)

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I have a girlfriend before, I do love her. She had, had this short affair with a friend, that was a long time ago before when we're still at our 1st year as lover's. It happened in summer when we had to go on to have our on-the-job training in separate places. We've promised each other never to have any flings or whatsoever. But it did happen to her, and i think she was immature that time. It was one normal rainy evening when the time i found out about the affair. She was cooking something that time, and quite sexy while wearing my shirt on. i just happened to sort down things in her cell phone. And there is this one folder i couldn't open and i'm curious about. But then i asked for the password, neglect, she gave it to me without ever wondering what is inside. She forgot! For Christ sake, she forgot of what is inside. The messages inside the folder was the messages of their affair. I've read every single detail of it, while her not noticing that I've grown into confusion and fury. I've got so pissed that i couldn't understand myself, my face burned red and i couldn't focus my sight for that moment. An hour passed, I was feeling relieved with my anger but then I raised the questions to her of what, why, and how did these happened. She cried that night in her knees, begging of me not to leave her. She did everything just to please me. But my love and pity for her resides, it won over my pride. I forgave her... That was the first time my heart bled. I forgave her that night and then not realizing what it may cause me if i wont let the feeling of anger be out of me. She told me that nothing happened between them, but I didn't totally believed her. She said she's really sorry, but it did really hurt me from that much that i tried to keep it to myself but it still kept on resounding back and it won't stop. Time passed, we graduated and both became engineers. She went home and tend their family business. While i am left here in the city where i am pursuing my career and stuff. We call each other and text, months have pass but, loneliness grew in me. I can not fight it. I tend to work it out through going out with my friends but still it is not enough. I want her beside me; I always ask myself "WHy did i let this happen?"One night in a bar, while with my friends having fun. I met this girl. "By God, I think she is endowed with such beauty and grace." I observed her from afar and got hooked by her. We got acquainted and from then on everyday i get to visit her; we eat dinner together after work and after her school.We do what i and my girlfriend did before. She filled my longings for my girlfriend. I was happy until a month after she approached me of a news that she is pregnant. My girlfriend knew about the situation now. She knew that i am living with the girl. And she's begging for me to come back. What should I do? I am confused...