Idk how to move on

Me(F19) and my (ex)boyfriend (M19) still gives me chills calling him my ex , he was my whole world . We had the most perfect relationship for 2 and a half years . I know we are very young but we really needed each other as both of us faced huge problems since the young age, family or friend issues ,but we were mature . Everyone who knew us , called us perfect couple. Until I made a mistake, something that wasn't so big but it broke his trust ( tolerating someone who was flirting with me , told him I had a boyfriend but didn't stop him not because I liked the attention but I didn't put much thought towards the convos with him , that was my stupidity) , for him I crossed the line and it's hard for him to continue the relationship. He says it has affected his self respect. I am very sorry and will always be . I don't want to give the relationship up . So do my friends and some of his. I requested him for a second chance , but he doesn't want to , and i don't want to force him . But he was my everything. I am lonely without him . He was my bestest friend, others feel quite distant , he was really my everything. He was the family that actually made me feel worth and loved me . Only person who loved me . All of my experiences are horrible, everyone has betrayed me in my life . He really is a sweet guy and I wish I never had done that but its really hard to live without him , my family is harsh and makes the situation even worse . Just having him usually solved a lot of problems. For everything I have gone through in my life since my childhood , felt like he fixed it , and I never thought we would break up, especially like this . I just hope he stays happy forever and I become stronger. But there is just something in me that doesn't want this to break.