Break up

My boyfriend of almost three years just broke up with me today. I don’t know what to do. I know I should focus on myself but it’s easier said than done. He told me he doesn’t want to throw away 3 years like that. Then why break up if you don’t want to. It hurts so badly. I’m hoping he comes back and gives me another chance. He hasn’t changed his profile picture of us nor his relationship status so Idk if he’s thinking about staying since he’s been online multiple times since breaking up with me earlier today. I feel like it’s my fault because I overreact and get upset easily and I can be a little manipulative and I didn’t even realize it. He has his problems too but I had more. I said I’d change. I tried convincing him to stay. I sent a long text apologizing for all I’ve done. I’m hoping it works but if it doesn’t, how do you get over a breakup? I know the basics like hang out with friends, get a hobby but it’s so much easier said than done. This guy was my everything and still is. I’m just so broken.