I don't think they are playing with the full deck, very erratic behaviour
I think H could well be heading for a breakdown, if he's not already in the midst of one. M has stripped him of everything, apart from the nipper, that he holds dear, ( apart from money obviously!)
This will have a devastating effect on his sense of self-worth, purpose, even his very identity.
Being common, an analogy which occurs to me is a footballer retiring. Over half divrrce, (that's the good news, for him),
but many become alcoholic and or depressed.
Also, you have to factor in that he's married to a fucking nutter, which never helps.
I saw an echo of his parents un pleasant self-pity before M, when it was "nobody will want to marry me,", but given the right spouse, his fragility would have not been in-surmountable. Thanks to M he's now burnt more bridges than Hitler's forces on the Eastern front. Of course he is accountable, but she is definitely the dominant partner.
I hope he is able to retirieve his better nature when M is onto the next poor bastard.