He was never a sweet, kind man. That was a fake front he put on. He didn't change. You just got to know him better. Basically, you wasted a lot of time on a guy who was never worth it. Maybe dancing with him felt good, if he was a good dancer.

You might think he has moved on to another relationship and is doing better than you. Sooner or later, he'll show his true colors to any woman and any relationship he's in will go sour. He only wants to use whoever he is with.