How to sue an ex-spouse for money owed?

Question Details:

My ex and I bought a house a few years ago. I made the down payment and he payed the mortgage. The loan was in my name only but the house was in both our names. The whole deal fell apart and he was to pay me back for the down payment. But he stopped making payments when I filed my taxes and claimed the house. He also let the mortgage go into foreclousure before he finally got it refinanced so my name is no longer attached to the house in any way. I have a simple unnotarized document saying that he was going to pay me back the money that he owed me for the down payment. Will this hold up in court? What I really want to know is whether he can get me in trouble for claiming the house while he was "making" the payments if I take him to court?

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