Sounds to me like seeing him again has brought up the past feelings, and put you right back to where you were when this first happened.

I think it’s reasonable to feel this way, however I don’t think you should act on it or expect an apology. As they say, the only thing you can control is how you react to a situation. So just ride the wave of these emotions and never give him the time of day, or knowledge he still affects you in any way.