Hi NightJay0044
Welcome to the forum.
First, are you absolutely certain that you are right?
Next, if you are certain, and it is really over, then you need to come to terms with the fact that you are grieving ~ grieving for a relationship that lasted a long time and meant a lot to you.
You will have to deal with this as you would with grief of any kind ~ give it time.
Time heals, they say. Maybe so, maybe not, but it certainly does help.
Allow youself to grieve, but also find other things to occupy your mind and your time. Try to fill the void ~ as Sal said.
Maybe you could join a club, or a night-class, or take up a new hobby.