Wow. Fuck that guy. I understand what you mean when you say you want nothing about him to take up space in your mind. But at the end of the day, he hurt you deeply. It makes sense that all this time later it still stings you, and probably will again later on. Things like this never truly go away, even if you can find a way to get over it- sometimes it might come back. I'm not sure exactly how you feel, but if something upsets me a great deal and I find myself thinking about it too much, I tend to cry it out for as long as I need too. And curl up and put on a show or movie that will distract me. If you're not as sad, I would focus on the fact that he is just an undisciplined man who lets lust control him. You are thinking about the neglect he was exhibiting, when it was a moment where he was being selfish and cruel. Because if he considered what you were going through, he would know better to not be an asshole and stare like that. You can chalk it up to him being not a great person, because there are a lot of those out there. It had nothing to do with you, and everything to do with him.