Confessed and dissed!

Ok, my sister gave my number to her friend without telling me, but I was okay because he was cute(I hadn’t seen what he looked like, but she said he was. His name is Keon by the way and mines is Cydney). So anyway, we had been talking the whole week and he’d had been hitting on me, and making comments to me in a flirtatious I like you way, and at one point sexual. I felt like jumping up and down, because it was the first time a boy said stuff like that to me. By the way im 15 an never had a boyfriend. So, a few days later he confessed (over a text) that he likes me, a lot! I said even though he was 13 I liked him to. So we showed each other what we looked like and let me tell you he was fine. He even said I looked really fine! I was so happy again because a boy never said that to me. But, that would be the last time I would be happy. The next day after confessing he says he has to tell me something, and I could tell it was bad because he usually texts me early, but today he was late. Thats when he told me, he had a GIRLFRIEND! I was so crushed, angry, betrayed, and I wanted to cry. He hurt me so bad. We had told each other our deepest secrets and he kept the biggest one from me. He told me he couldn’t tell me before because he was scared! He said he told me because he didn’t want us to start a relationship and get strong, and tell me then. After, two days of him blowing up my phone, feeling horrible, and not being able to function in school from hurting me I forgave him. But, deep down inside I’m still so hurt. How do I get over him, when he texts me everyday?