I just can't get over him.. No matter what I do.. I can't find peace in my heart. Fuck me. Shit.
Try to focus realistically on how he treated you. If you become addicted to some one emotionally and/or sexually (which is normal, it doesn't mean you're stupid or crazy, it's oxytocin pair bonding, people who don't do it are actually more worrisome as humans, and if you find though you do this too easily through one night stands or short term things that happened a couple few times, you probably should avoid casual sex for your own health)....the best way to remedy this is to focus on if the person actually treated you with love and respect.
It's super hard when you really feel close to someone, like the intimacy factor, so don't be hard on yourself. Let yourself be you don't have to "get over it" but if you are depressed focus on activities you enjoy, especially things that are easier to do without him or thoughts of him consuming you. This will remind you of the whole capable person that you were before you met him, and that you can be even if totally celibate.
Cognitive Behavioral Therapy works. Even if you feel bad, if you start reframing things you can possibly bounce back quicker than you thought. It's ok to grieve, but changing the way you think about things actually will eventually improve your emotional state. And sometimes you will still think of him, you didn't fail, life goes on, you are human.
Information is so important. Learning that love is a choice was so meaningful for me.
Even without sex, emotional affairs and crushes occur. This can be almost or just as painful, depending on how close you two were, or how you idealized him. Eugene Onegin is the best book about romantic crushes. When Tanya realizes, there is no real Onegin. Don't like books, ok, but still you can focus on what actually happened, how did this person treat you, what quality did he have that you admired, and that love ultimately is a choice and is about bonding with another person, not chasing. Chasing is infatuation, and the basis for most relationship dysfunction from crush to dramatic sexcapades that end in murder suicide. THAT IS NOT LOVE.