How to get over someone?

So I’m a 17 year old girl and I’ve been messing with a guy who’s been my friend for a while. We used to “talk” over the summer and he would always give my reasons why he can’t be with me. He told me that if I wanted to be with him I would wait for him to be ready to be in a relationship. So we’ve been basically friends with benefits since then for the simple fact that I don’t want him out of my life and I was “waiting” for him I guess(while he was also messing around with other girls). Now, he is messing with this girl he really likes and always talking about her and puts her on his social media and I’m almost sure they are dating.I don’t think he knows that I still feel the same way about him because we are still kinda friends. I don’t want to feel this way anymore. Any advice?