Tips on getting over someone who used you

Months ago one of my best friends admitted he had feelings for me and I had liked him for years but always pushed it away. He was really into us being a thing and telling his friend (who was my ex and we met through him) so we could be together because he thought that since he cheated on me that that kinda forgoes the whole bro thing... Idk. Either way we were seeing eachother and we had sex, making me his first. We did it a couple more times after that and then we just stopped talking. I felt so used and when I told him he just didn't care and didn't deny the fact that he did. I'm still not over it and a couple days ago I made the impulsive decision to text him and he asked if he we were good. I told him we weren't and told him why and he apologized and said that he met someone and they helped him realize how he's been treating people. It made me so mad that he's moved on and I'm still hurt even after months later that I told him his apology doesn't mean anything and that I don't want to talk to or see him again. I'm so beaten up about it because he was one of my best friends and this really screwed up my trust with people and I just constantly feel like I'm always gonna get used by guys.