Sorry to burst your bubble but feel the need to say something. I am new here and haven't posted my story yet. Been just reading and will make a post soon. But am going through something with some common things as to your sitch. You are acting out of hurt anger and are wanting revenge. That's the hard thing about one side to a story. But one thing that popped out at me HUGE is that YOU had an affair! YOU broke your wife's heart once upon a time. YOU broke your marriage vows and were weak. Then lol go figure you are out there with a private investigator digging up stuff to use on her. I don't know how you do that with a clear conscience knowing you are guilty of the same. Then going to go off on a tangent about how she MUST just have mental issues to be having an affair and moving on with her life. She could have said the same about you. I am sure she would have said negative things about the woman you decided to put your penis in.
One thing I want to mention is what you did to her I am sure hurt and broke her heart bad. Do two wrongs make a right, no they don't. But what you are doing right now on your quest to rip her child away and tear her to shreds as much as you possibly can is in my opinion very hypocritical. You talk about her metal health well I am sure you contributed to that when you slept with another woman.