My sons dad wrote me a better nasty note and left in in his diaper bag when I picked him up from his house last weekend. It said that he doesn't want my our son anymore because he doesn't like seeing me. He doesn't care about my son, he doesn't think what this is going to do to him. Now he says that if I try to get ahold of him he is going to file harassment on me. What am I suppost to tell my four year old. He has been going to his dads every other weekend for the past 4 years. Any advice would be helpful?