Far from stupid. What your H is doing would push anyones buttons. Fight him on this. He's crazy and has proven it over and over. But one thing, stop telling him how much this hurts you. He isn't going to stop because of that. I wouldn't say a word about the custody issue and file your paperwork and let the attorney handle it. He probably doesn't have any money for an attorney so when he sees your stuff he will most likely get nervous.
Me: 46 FWS: 36 Married and Divorced 4/07, Pregnant 7/07,False R 7/07 Baby Girl born 3/08 Kicked him out because OW: 7/08 5/10 He realized what he had and lost. Moved home! REMARRIED 3/14/11!!