Is she jealous? Why is she competing over him?

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ok... I went on 3 dates with a guy, who pursued me. This girl, started liking all of my statuses on face book which I thought was creepy, I had to block her from seeing my statuses. Eventually, He dumped me because I refused to have sex with him. He told me he had needs. Then a couple of weeks later, he started dating the girl I blocked. She kept mocking my statuses on face book,

I got into a relationship, so I deleted him and her- because I got tired of her bullying me. He sent a message afterward asking why we couldn't be friends, and was it because I was in a relationship , so I ignored it. This was the day after valentines day.

A week later, the girl I blocked, gets a mutual friend to call me and ask about my new boyfriend.--------> What is going on here?