What does is mean when your ex boyfriend keeps staring at you?

Pinky123_
I was at my friends birthday and my ex boyfriend kept staring at me. We haven't talked In 4 months after our break up cause he got with another girl. He is still with her and I'm baffled at why he was staring at me? I thought he "moved on" and was content with his new girlfriend?
Bu anyway he kept staring at me I made no eye contact with him throughout the whole night. Did I do good? And why did he keep looking at me?
What does is mean when your ex boyfriend keeps staring at you?
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