I screwed up with a really nice guy and i need help?

im 17 im one of those girls who gets screwed over, not the other way around, on new years this year i hooked up with this guy and he just forgot about me so i added his best friend whose 19 to talk to him about it n we got pretty close n he took me out for valentines day n got me a gifts n ive been to his house n he told me how amazing i was and how i deserved to be treated right n everything was going great until one weekend i was bored and my ex asked me to go to the beach with him my ex was still in love with me and hes really fragile and suicidal so i let him kiss me and he gave me hickies, and when i went to school the following day a mutual friend of the guy i was seeing saw them and i guess told him, the guy stopped speaking to me and at the time i didnt know why, at first i was confused because we wernt officially bf/gf or anything n didnt really understand why he was so upset, i eventually figured it out realised what id done and how much i would have hurt him cus i was told he was depressed and sitting by himself at a party over me and sent him an apology, i received no reply, on his birthday nearly a month ago i messaged him and unexpectantly he replied but we didnt talk for long, my ex then screwed me over so theres my karma, after telling me he still loved me turned up to the same party as me with another girl who i go to school with so screw him i never wanna speak to him again. ive been going crazy cus i havnt heard from this guy so two days ago i sent him a text asking if he wanted to catch up one day soon cus i miss him and want to apologise in person and to please think about it, he hasnt replied yet, n its driving me crazy, i lost an amazingly sweet guy n i want to prove to him that he can trust me and this was a one off thing where i was confused about my ex, i want a second chance but i dno where to go from here, or if he even is gonna reply to my text at all, he's not the type of guy where i can just turn up unexpectadly where he is either, his job involves him travelling in his car n yeh i dno, i really need advice cus i like him so much and i screwed up and ive never been so stupid or sorry in my life, this has been going on since the literal end of february btw, i feel so aweful cus hes so sweet and has been screwed over by girls before and he trusted me, im really impatient too which doesnt help :/ advice please guys im going crazy