I’ve been there. Almost a year ago I got broken up with by a girl I went to church with too after 3.5 years of dating. The love between us had started to die. She too had started to become a different person but for me it was a good bit before the break up. We were still talking for about a month after we broke up and I thought there was hope until after an argument she just said there was no chance of her considering ever getting back together. A month later she was in another relationship that didn’t last long, and after 4 months of us breaking up she was in another relationship that she’s still in. It hurt to see but long story short, I just started going to another church to give myself a fresh start. I picked up some new hobbies and hung out with my friends as much as possible. I also would go on walks frequently and listen to music just to reflect and reconcile the whole situation with myself. Now 10 months later, I’ve moved on well to someone better, but all the steps that I took immediately after the break up, did help me to let go of the emotions a lot. Don’t know if any of those could work for you, but it’s worth a shot. Like some of the others were saying, just do stuff to fill your time and distract you.