How to get over a man who I thought liked me but is now falling for someone else?

A man I worked with for a time was very nervous around me. He’d stare at me from afar and would on some occasions check me out and linger around me like he wanted to talk. I reached out offering friendship as an outlet for us to get to know each other as I didn’t want to rush things and he didn’t give a reply.

Today, I indirectly overheard a conversation him and another co-worker of mine wherein another girl I was not aware of name popped up. When I got upset he just ignored me and kept on talking to his friend how great this new girl of his is. He keeps on saying her name around me and turns his back to me. I never had a chance. How do I get over this pain?
How to get over a man who I thought liked me but is now falling for someone else?
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