"will I ever get the happy girl I met again back" I get that said to me a lot. and I usually remark "Oh, the one that did (insert insane, hurtful, or messed up thing here)? You can have her back if you want just give me about a week." and I stand there's smiling. Usually that's when he realized what he just said and tries to back track.

A lot of this seems like he's having issues accepting the adult he's become and at least partially blaming you for it. He needs a therapist of his own to deal with this and any stress that his or your issues bring to him. What did you guys do when you went out before.