Why does my situationship coworker watch me drive away when I'm leaving work?

This coworker and I had a situationship. We've kissed and discussed that we both had feelings for each other, but the relationship couldn't go any further because we want different things in life. He wants to have an open relationship & I don't. So to move on I blocked him from everything social media and just living like I never knew him even though it kills me inside. He hasn't tried to reach out at all. No calls or texts. But when we pass each other by at work I feel his eyes on me, and he's sat outside and watched me drive away from work. Why does he do this if he doesn't love and care for me? Is he just trying to get at me?

Why does my situationship coworker watch me drive away when I'm leaving work?
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