I feel sad..help plzz?

okay so I had a jerky frnd....he was really sweet in the begining of the year and then changed his colors after the 2nd week of a sport, I started to like him 2 weeks ago. He started talking behind my back so I broke our friendship. He doesn't seem to care and its bothering me, he just shook it all off. I feel useless now and incidents like this have been makign me feel really sad. What should I do?????