What is the best revenge or way to handle a cheating fiance?

Let's say you were with a woman, who cheated on you for 2 months with another guy, and left you for this guy. You were not perfect or flawless, but you never cheated on her, never disrespected her, and never screwed her over in any way. You stood up for yourself, and never allowed her to walk on you like a doormat. You grew suspicious over 2 months that something was going on between her and this guy. You asked her repeatedly about it and she denied it strongly. Then one day she dumps you, lies to you that she wants to be single and that she is not seeing anybody else, and a week later you see her and this guy kissing at a local bar. Keep in mind that you had purchased her a $5,000.00 engagement ring, you have a child togetheir, you live togetheir, and were togetheir for 3 years. Yeah, you could say maybe she wasn't happy with you anymore, or maybe she felt she could do better than you. However, keep in mind this guy she cheated on me with is no better than I am. I have a college education, I work full time as a financial yst, I pay all my bills, I fully support our daughter, I don't have a criminal record, I don't have any disabilities, I don't have any issues, and I am not a woman beater. The man she cheated on me with works for the telephone company as a laborer, rides a harley, has tatoos all over his body, and has a drinking problem. Again, I am not perfect or flawless, and every man is different but I don't see how he is any better than I. What is a sensible way to handle this type of situation and come out on top?