My boyfriend just told me were not going out any more[its over] what should I tell him back?

Tell him that you thank him for not stringing you along. Tell him to have a good life, then get on with your own life.

If he has made his choice about how he feels toward you then you are going to have to accept it and move on. Find someone that wants to be with you not someone that doesn't.

Good Luck,

Javi