Foreclosure on my credit but my ex was supposed to pay

I need some advice. I divorced almost 4 years ago. I had a home that was to be put on the market and sold. My ex and I were to split the profits. About $15,000. each. for over a year it was on the market, he rented it out. This year he let it go into foreclousres. He said I won't get a dime from him anymore. "He also owes back alimony". Anyway, This is on my credit report. According to a judge, he was to sell it. How can I get this off my report or will I be able to? I need help.
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Probably notbut you can add a comment about the divorce decree.
You can sue the man for the lost monies due to his stupidness and non conformation to court mandates, the credit disruption and future cost associated, and the alimony. I would place a comment on the foreclosed account.50 words or less with a court number