Breaking An Engagement "Breech Of Contract"

I was engaged several years ago and kept the ring. In the past three years we have dated several times however he never asked for the ring, as a matter of fact I offered it back and he told me he did not want it. Now (3 years later) my ex-fiancee is threatening to take me to court for breech of contract if I do not return the ring to him. My question is this: Is an engagement of marriage and an engagement ring a legal binding contract in Florida and can he sue me after all these years for the ring and/or cost of ring plus court fees? If so isn't there some type of time limit for filing such a claim?