I don't see what the problem is,they are both content in the misery provided by the other. Better shared between each other and thank heaven for small mercies no children are embroiled in this 'marriage'.
She married a man because he was marginally preferable to the life she endured with her overbearing mother.
She has never once mentioned him with any fondness even retrospectively. If he worked out she only married him cos he would do it's little wonder his behaviour your escalated.
Two years to get an annulment told her everything she needed to know. And he came with debts already incurred.
Male egos are just as fragile as everyone else's, and I can totally understand why he is stoned all the time. I wld be too with no reason not too.
They have made a joint decision to make a miserable life together.
I wish them all the best. And hope that one day they both find something worth changing for.