It sounds like in the past when he was doing well and spent so much money that there really was not an "us" but more of "I am and My world" and my ego. And he was still very young yet too. Losing all the power can be especially hard on someone so young in that often there is no real maturity to emotionally handle that kind of loss. It sounds like he is emotionally devastated. This has been an extreme hit to his ego and he doesn’t know how to handle it. So he is distancing and sulking and angry.

His behavior in having to state what he did do and desire you to feel guilt that you can’t cover his expenses is reflecting his own anger and resentment and ego and isn’t about you. He is divorcing himself from the loss and there is no we in this. He doesn’t have the maturity for that and instead he is choosing to distance from any reminders including you. He is much too angry and that is what his responses are saying about him.