<human>: I understand that no one wants to hear that you're in a relationship with someone and your SO still has something for someone else especially an Ex. I did my best to deal with this on my own but I still have to see her every week because of we have a son together.

I didn't leave my ex-wife because i thought she was unattractive, I left her because of all the problems we had together. As time has gone by she's been slimming down to what she used to look like in high school and she's becoming more and more attractive to me. I told my SO all this and that I have not nor do I want to be a cheater. 

It got to the point to where I was trying to find way's in my head to have sex with my ex-wife, which I know for a fact I can, without my SO knowing. That's when I decided I couldn't do this on my own. I told my SO everything and she left me. Suddenly the need to have sex with my ex is gone and I want my SO back, but I feel like I trusted my SO and turned to her for help and she abandoned me. Am I wrong to feel this way?

Summarize the given text in a few sentences.
<bot>: I felt like cheating, and told my SO. I feel as if SO abandoned me when I turned to her for help. I love her and don't want to lose her but is she worth trying to gain back?