Since we do not know the incomes, etc., I would suggest that you contact a tax preparer and pose your questions about the way to file. Also, I would ask about what "he" thinks he should be able claim every other year. Don't agree to anything without checking w/a professional or your lawyer when it comes to money. Mlcers tend to ensure that they get the better end of the deal and will attempt to leave you w/little to nothing.
When my xh walked out, we filed jointly for the last year that we were together, but the following years, I decided to file separately and to be honest, it was the best decision that I had ever made for myself.
Talk to a professional before doing anything. It's important that you get the right information up front so that you won't have any regrets later on.
