Why does my ex boyfriend give dirty looks to new guys I hang out with and keeps on looking my direction whenever I am around?

Anonymous
We are broken up for a good more than 2 years now. On and off in 2015 but he decided to cut all communications in Jan 2016 and that was when he moved on to another girl. He was with her for 6 months or so I think? A friend of his told me they broke up cause she cheated on him (Karma, I guess). Then starting from August whenever he sees me around on campus he'll keep on looking at me. I didn't realise till my friends pointed it out. Didn't bother cause who cares about him anymore right?

Anyway, so I just casually made friends with guys just to expand my social network no intentions and whenever he sees them with me, he gives them this dirty look. These friends of mine noticed and will usually tell me. But in my head, i'm just technically "what is wrong w this asshole?". Like, he was the one who dumped me and such. Jumped from one girl to another 2 weeks after we broke up till today. He was also the one who wanted to cut everything off.
Why does my ex boyfriend give dirty looks to new guys I hang out with and keeps on looking my direction whenever I am around?
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