I'm so sorry
I know how it feels and I have to be honest, there's really nothing anyone can say to you to make you feel better. You just have to wait it out. Expect up and down mood swings, like one minute you'll be like "fuck him, i'm better off" and then you'll be so depressed you can't even see straight. Just give it time and it will be better. Don't think you can replace him with someone else, I made that mistake and it doesn't help with the lonliness. Keep busy with friends, immerse yourself in a hobby, or take a vacation somewhere that doesn't have any memories of him. You'll feel much better in a while and you'll wonder why you ever thought it was so hard not to be with him. You're in my thoughts
