Witnesses are not allowed to date "worldly" people. He was being unfaithful to his religion (not God) when he was with you. Be careful that your heart does not get you trapped in an abusive cult trying to get him back. It probably won't happen. He is trying to put that time behind him and probably wants a Witness girl to salve his consciense.
In the meantime, you may want to look at moving on too. If you choose to study this religion, do it from all sides. Read on this board and google for more information. A good question to ponder on is why he was not allowed to even talk with you so suddenly? Why are children and parents not allowed to talk with one another for life if one chooses to belong to a different religion after being raised a Witness?
Be careful because they have a way of making you think you are really loved until you get baptized, it's called love bombing. Look up some info on cults too. That will explain much of what you are experiencing.
Best wishes to you!