Codependency

My bestfriend of 3 years and I broke up. It wasn't a closed door but we shared friends and we were each others everything for so long. I'm realizing how codependent I was on him for so so long and I want him back but I know that's not right because I need to go on a self love journey. I need to be without him. We are going to talk today ab things and how to move going forward. I saw him at the bar with some of our friends and he didn't say hi and kept looking at a baseball game. So I am bedridden right now. I feel like shit I left the bar and came home and had a severe panic attack. How do I get through this?