It's just further proof that his real interest is not in having S2 for more time, but in pushing your buttons by using it as something to fight over.
The good news is, he will probably fade away into an occasional Disney dad, and although normally that would be sad for your son, in this case it is likely for the best.
My sister's husband left her for an affair partner when their daughter was 2 (this affair started while my sister was away with her 2 year old caring for his dying mother - a woman who had always been AWFUL to my sister but my sister is a saint and there was no one else to do it). He's really an actual sociopath and was a terrible father to my niece - didn't attend her basketball games or band performances, spent little actual time interacting with her on sparse his visitation etc.
However - my sister remarried to a guy who was a GREAT stepfather to my niece. He went to all her games, totally supported her in her endeavors etc.
Now my niece is 30, an ICU nurse. She refers to her biological father as "the sperm donor" and has little to do with him. Her stepdad died unexpectedly a year ago this week and her posts about him are very moving. She had a real dad, he just wasn't her biological one. And she's been better off that her bio dad was a sparse presence in her life since he really is pathological.
