Legal Question in Family Law in Florida

I'd have to read your agreement to be sure, but my quick answer is: No, it's not strictly legal for him to make you pay rent, but it isn't legal for you to stay there, either. If you stay, he probably has the right to file an action known as "partition," which forces the house to be sold by the court. Maybe the two of you can come to some kind of arrangement until the market gets better. But that might be a long time.