A break up or divorce is really no different than a death when it comes to grief. Loss is loss.

I am very embarrassed to admit this but it took me eleven years to get over a girl once. I went with a girl for two a half years in high school. In my mind we were going to get married and live happily ever after. She went away to college and I stayed home in community college. She met a guy and dumped me. How in the world did it take eleven years you might ask. I know very well why. I was drinking and using the whole time. I never grieved it. I didn't think about her everyday or anything but periodically. I never got over it. I even got married and my wife could somehow sense I was still holding on. It wasn't until I got clean and sober and really worked on it that I got over it. I even called her to ask what happened and to apologize for my part. I got closure from that.

I am not saying any of that applies to you but that was my experience.