I don’t want anyone else but my ex.

My ex and I broke up Bc I wasn’t being loyal Bc he wasn’t but I never did anything physical with anyone just flirting over the phone. So we took a break and then we started hanging out and having sex again and he would take me home after our track practice and then today he didn’t talk to me at all and posted that he was single and didn’t even ask me if I needed a ride so I had to find one. We were literally together last night So I texted him and asked him for my stuff back and I’m super heart broken. I love him and he was my first love, first kiss, and I lost my virginity to him. I love him more than anything and he’s totally fine but I’m destroyed. I have no idea what to do. Any advice?