My fiancée and I just got engaged 2-3 weeks ago. We have been together for 2 years. We have a normally very mature relationship. Things were great until 3 days ago. She got mad at me for reasons unexplainable and said she wanted a break. When I pressed her about it she finally spilled that she had hung out with a guy that she had an attraction to and that things had gotten out of hand. They didn't have sex or so she says but they were kissing and feeling each other up. She says she is sorry and feels ashamed and guilty and wants to change and be better for me. I forgave her but I can't forget. I have drank every night, can't hold it together. Why do that to someone you love? I don't know how to cope or what else to do. I need help.