Go ahead and do your own taxes. I don't know what all is going on - we aren't in on your conversations except what you post (word for word). But if he isn't giving you his paperwork, and you have your own ready to go and he's not coming over to help - just do yours and let him worry about his.
Don't let yourself get too emotional about things if you can help it. Think of CHL as dead weight that you need to cut loose. The R with him is dragging you completely down. Hopefully you will feel free once the D is over - whether or not you two get back together in the future.
