<human>: We have been married for ten years, March and together for 12 years. I'm 36/m and my wife is 40/f. Things have been rough between us for the last three years, and they don't seem to be getting any better. We have one child together, a 7 year old daughter who is my life and she is the reason I've stayed as long as I have. My wife is a basically good person, but she can be tough to be around. She holds grudges, never forgives, is perpetually disappointing (and in my opinion ungrateful). Its taxing to be with her. 

So I cheated. Which is very wrong, but its the decision I made. There has been more than 1 affair, but the most serious affair has been going on since last February. The girl (23f) and I met at work, and I was responsible for showing her and a couple other younger workers the ropes. She worked under me very briefly, but she works somewhere else now. Our affair has continued through the job moves and we are more serious than either of us ever thought we wanted to be. 

I've come close to confessing to my wife and asking for a divorce before, most recently in early December but the timing never feels right. She will make small changes and make me feel like she is changing, or that she really cares about me, and I back off. And then we go back to normal and I jump back into the affair. I'm scared if I end our marriage my wife will hurt herself, or not recover. I'm scared for our daughter and what it means for our relationship. I just need some advice on what to do going forward. Should I try to work it out with my wife or should I pursue a divorce. How will I be able to do what I have to?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Cheated on my wife after years of disappointment. Not sure if I should end the marriage, or if I can end the marriage without hurting her. Need help/advice/guidance