Am I able to sue my cousin and win because he admitted that he caused it to the court, or does the bankruptcy hold me back?

My ex-roommate left on a trip without paying rent during our lease and I couldn t afford the rent on my own, so we were evicted. The creditors were coming after both of us at first until I made him sign a release of liability stating that he caused the issue and that he will pay it. They stopped calling me, went solely after him and it was taken off of my credit. Then my cousin filed for bankruptcy and they began garnishing my wages, so I set up a payment plan and it is really affecting my life. They haven t put it back on my credit, though. My cousin also paid it with a stolen card once so the situation became worse when they thought I may have been involved. Am I able to sue my cousin and win because he admitted that he caused it to the court, or does the bankruptcy hold me back?