1) I recommend reading IRS Publication 504 Divorced or Separated Individuals.
2) If you are unmarried, your filing status is likely Single.
3) Check your Divorce Settlement Judgement, or your attorney, for any directions on how Taxes are to be handled.
4) If the interest and taxes are not described in the Judgement, how you handle it may vary depending upon whether or not you live in a marital property state, and possibly upon which state(s) the various properties are in, and how your ex-spouse plans to handle this issue. If you are in a marital property state and all the properties are in that same state, the interest and taxes during the time of your marriage are likely split 50%-50% between you and your spouse.
If not, I do not know the answer.
In either case, I suggest you coordinate with your ex-spouse, and your attorney if needed.
5) For the time after your divorce, it is likely that you are each responsible for the property (and interest and taxes) you owned during that time.
6) If the properties and loans are still all in your name, I think you need more help than I can provide.
