Can I sue my ex for not paying their half of timeshare maintenance fee?

I want to take someone to small claims court, and I'm tryinmg to find out if i have a case otr not. 4 years ago my ex and myself purchased a timeshare together. We split the cost of it. We have maintenance fees due every 2 years. I paid have the maintaince fee this years and sent an email to the resaor and my ex with the confirmation thast half the dfees have been paid, My ex was supposed to pay the other half, but did not. I di not know this, now the resort send the account to collections. If I pay their half, (which now how late fees and interest added to it) can I sue them in small claim court to recover it? What are my chances ? Do I need a lawyer?