ROCD help please,, any advice please 😭😭😭

This is a rant and a crazy need for some sort of advice. I’m 19 so keep that in mind when you hear how stupid this sounds but yeah,, I thought my ROCD would be gone now that my relationship is over… but it’s almost just as bad now. I can’t stop wondering what he’s doing. What if he moves on before we get the ending everyone is convinced we’ll have? And people are just like yeah, what if?? But it consumes all of my thoughts. I can’t stop tracking down the girls he’s followed since. He tried to reach back out to me and ask why I supposedly didn’t care (all I’ve done is care) and I blocked him in anger and tried to move on. I’ve gone out with a couple other people and felt a whole array of feelings for them but I feel horrible for it, and I know I shouldn’t but the people around me are convinced he’ll come back in a couple of months due to the way we ended and how he reacted and etc. but I’m scared I’ll do something wrong in the meantime… I’m scared I felt “bad” feelings, and I’m scared he’ll find someone else. This has happened to me before and it was the worst summer of my life. Everything hurts right now, and I’m starting a really big job tomorrow without him and I feel like I just can’t do it. My OCD is taking over and my job is ironically as a behavioral tech, but I just feel like I’m too young for this job and I’m too stupid to keep my lover around and everything is just horrible. I know I sound so dramatic but I seriously have no idea what to do or where to go right now and I’m so scared to live my life and have new opportunities without him :/ our sophomore year of college starts soon and we go to the same tiny juco, and we work here and there at the same off season job, so it’s inevitable that I can’t avoid him forever and it’s making me so sad