Ok ... from a guys perspective *ducks from the high heels*
When the kiddo comes there certainly is a record of us men feeling neglected, we go from the Knight in Shining Armour to the dungeon as the guy who created this baby being who is more work than any of us would have imagined ... especially for mom early on. I know I felt that way, and there is not a book they give us on how to handle the second seat, in a way we get it but I think what we miss ... least I did... was how exhausted she was at the end of the day , she never truly had the energy of me nor 'us'
However ... I do agree with the masses, he is still all about him, how wronged he was and not owning his side of the pie. I think thats the mistake I too made was she wanted to work on things only because she found herself alone, she never dealt with what put the MLC bus into motion, never addressed her issues .... I do not think your H has either. Knowing your sitch he has some serious Mommy Dearest issues, I am going to guess you focusing on your son sparked the MLC in him a bit and made him think about being neglected as a child ... just my hunch and something he needs to deal with before he can crawl out of his tunnel.