I know it’s very hard, but you have to let him go. Right now he is physically gone, but he is still reigning in your head and doesn’t allow you to have peace. The only way to free yourself from him is to live the best life that you can and surround yourself with people who genuinely love you. Empathy is a gift, not a curse. It’s the very thing that will draw people who truly care toward you. You can’t benefit anything from stop caring. It only further isolate yourself from the help you need and make you more miserable. And that’s exactly what he wants, seeing you miserable for as long as possible. If you can’t do it alone and have difficulty in forming good relationship, you can always reach out to someone who cares, like people on this site or a counselor. Your empathy is also what the world needs too. Just think about it, how many times you see news about a psychopath who thinks empathy isn’t necessary and that gives them a free pass to harm others? Or how many unfortunate incidents that could have been prevented if people just care for each other? Please, do not make other people suffer for the fault of a guy who doesn’t deserve to be here in the first place.