Anyone stuck ruminating/thinking of ex for an unhealthy amount of time, even several months later?

I have tried so hard to distract myself by being with family, friends, doing things I love, working, working out, but I am still incredibly stuck thinking of them and ruminating almost ALL of my days away even though it has been several months since we broke up. I have accepted everything in regards to the break up. I know some of this is normal after a BU to an extent, but this is really consuming me. No matter what I do or what I think of, it always goes back to them and how I miss them terribly. I can’t block it out for more than what seems like minutes at a time. I just sit here and ruminate and sometimes get nothing done, I even forget to eat at times because of it. Anyone struggling with this? I am feeling crazy.