Ex girlfriend dumped me, broke my heart, but is pissed because I don't acknowledge her?

Ex girlfriend of 6 or 7 months dumped me. I felt a bit like it broke my heart. But never showed that. I just moved on.. forgot about her and started dating someone else. She also started dating a new guy.

but now she is pissed cos I don't keep in touch and specifically because I don't even acknowledge her in public. I just go about doing my own thing or hanging with other people. Don't feel like going over to her and greeting her and making small chat. but she is quite upset about this and told me directly.

Why is this and what's your read on this people..?
Ex girlfriend dumped me, broke my heart, but is pissed because I don't acknowledge her?
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