It sounds like you are really hurting. I dont think it is good for you or your son to stay in this situation. Your wife has made her choice and she cohabits with you because it gives here the best of both worlds. I am currently separated from my husband unlegally his choice,and I know your hurt but trust me when I tell you..you must care about yourself and move forward..your son will always be your son and the law protects you rights as a father...gather your dignity and move out and on..good luck to you