He tells you he left them but you have no evidence of that. Pretty sure it’s not what happened. Even If he left, which I doubt, it could be cause they stopped doing what he wanted them to do like paying his debt or bills or who knows what. I am sure he’ll tell his next girlfriend he left you too and moved out because you were out of control crazy or something else of that nature. I’d not believe a word he says to anyone.

If you were married and filed jointly then return is not his. It’s both of yours. In addition why would he even get a return? You have no kids no student loans don’t pay alimony and do not own property and you both make loads of money. Why would you get a return? Well maybe this year because of unemployment, so it will be yours not even his. Weird.