<human>: I separated from my wide coming on 2 years ago - she lied and cheated and it all ended. We have 2 kids and only ongoing communication is brief and related to them. I have no desire whatsoever to get back together and although still extremely hurt by the lies and cheating have not missed her at all. 

Im kind of a bit lost and in all honesty still hurt. I hate saying that as I should just be moving on esp after this length of time. Reason for this post is advice on me. I really feel if her new relationship with the other person ended I would be in a better position and feel stronger. In know my happiness is not dependent on her status but it is clearly affecting me. Even if it did end I would still not want anything to do with her - but I feel I would be better able to cope/move on. 

Occasionally I will imagine her relationship failed and it makes me feel more confident and strong. When I think about her being happy and with someone else I feel weak and sad and its holding me back. I know it sound pathetic but is this just a major ego bruising? Is it ego making me feel this way? Before anyone says I want to be with her - please believe me this is not true - I have practically nothing to do with her and do not want to. Why is it that if she is still with the person she cheated on me with its harder for me - I suspect only ego here but interested in some more independent opinions

Could you distill the essence of the text into 1-3 sentences?
<bot>: Why do i care if my ex is with the person she cheated on me with - why is it seemingly holding me back when I don't want to be with her?!