Wife Cheated one time, need help!

Ok where do I start! We have been married for 9 years with one child. My wife has always felt insecure about herself and came from a broken family. She never knew who her dad was and lived with her grandparents because it was a better home than living with her mother. I started a business 3 years ago and work a lot. To make a long story short I love this women! I always have and still do. I always wanted her to get a degree (nobody else in her family ever graduated) so we sent her to school. Our plan was for her to get a degree just in case she ever needed to work. So she went into a 2 year program with 20 others. Over that time she made friends with her classmates and I could not be more proud of her for doing so well in class. A month before graduation she would make comments like "you let yourself go" "sometimes I think we are together just for our child" ext. This made me wonder what was going on, she is such a loving lady and not like her to say things like that. Fast-forward she went out with her class-mates the night before graduation and came home at 2:30am after we agreed 12-1am was tops. I was so angry, she was sloppy drunk too. Over the next 2-3 days things seemed fine, I noticed she was not friends with one of the guys she went to school with anymore on FB. When I asked her about that she said he made some inappropriate comments to her and he was young and immature. I found this odd, so started the questions. She broke down and told me that she slept with him one time (the night she was late and came home toasted drunk) and that over the last month he / they had been texting back and forth. She said he would always say how nice she looked ext and there was no sexting. She said she was having fun feeling wanted by someone else. She said she never planned to do anything but knew it was wrong of her to be texting back and forth. When they left the bar that night some of the other students told her she shouldn't drive. He said he would dri ve her home and on the way home he made a move on her. She is VERY remorseful. Cut off all contact from him before I knew anything and is doing everything to make up. I do love her and I know she loves me, but I am having a hard time with it. It has been 8weeks. We are both 34 Should I give it a try? Why did she let herself fall into this? The guy is ugly and about 120 pounds! I want to beat the crap out of him but love my daughter to much to go to jail over it.

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