I need advice asap

So i met this boy back in like December n we started talking as just friends n had gotten really close and ofc i fell for him. I didn’t tell him how i felt for a solid month or two. I was scared how he was going to react. I told him by saying “i used to like u” when in reality i rlly liked him. He said well u should’ve said something earlier bcs “we could’ve been a thing” and i was rlly bummed out. But in the past couple months, hes been flirting with me and he txts me by saying “i like u” and things like that when i give him signs i like him bck but he still won’t make any moves. SINCE AROUND JANUARY THAT I TOLD HIM HOW I FELT. Also idk if it would be the best idea to still want to be with him since during a week i was out the country, he started txting my bst friend n flirting with her. He obviously didn’t tell me, my bst friend did. Something else that he did is when his friend told him he likes me and he wanted to ask my out, he said we had a thing and used to talk when in reality I didn’t know we did? That made his friend back off. Ik thats not right and I shouldn’t fall for that type of guys, but every time I see his name pop up on my phone, i get sooooo happy :( Im always saying im over him but then we see each other in the hallways and my heart races sm. Idk what to do, i have wasted too much time on him and I’m probably waiting for something thats never going to happen 😔