I think what they are saying is handle you're taxes but leave it at that.

For what it's worth I have to say do not be selfish with the whole tax thing. You were living together all or most of last year right? I would think that both what is owed and what will be returned is at least morally 50/50.
I do understand that it's hard when you don't have a lot but being selfish will not get her back.
Good Luck