Breakups😞😞

I'm hurt , torn apart and completely broken we've only been together 6 months but it felt like forever I'm so comfortable with him and completely in love he feels the same but he lied to me constantly and I just can't do it anymore I'm 15 and he's 21 and I know it's a big age difference but everything was great until his past started coming back up and his past was all about drugs we got in a fight about him hanging out with his old acquaintances .. He's denying it but I know he's lying .. I told him I'm done and I'm dropping off his stuff today .. But I'm jus so hurt any advice to help get over itÂ