Most Helpful Girl
Sorry to hear about your situation. it's really hard getting over an ex especially if you have a child with her but everything takes time. Go through the moving on process, it may not be that fast but at least start with it now. One of the stages I remember is acceptance of your situation and would result to I think forgiving. Until you reach that stage and completed the moving on process, do not be in a relationship because it would just be unfair to the other person to be involved with your problem - spare others at least.
Try also to seek consultation with people who are experts in that kind of situation or seek spiritual healing / marriage consultation - it would surely help.