Tough breakup!

So i have been in a relationship with him from the last 2 years. In the beginning it was fine and now I am growing very sick of our relationship. I dont want him and neither do I like him. Im not emotionally satisfied, im not sexually satisfied, im not secure with him. I've tried breaking up a lot of times but he is crazy. He always does all these crazy things like trying to kill himself and all. And I camt do anything but step back. Im really in a big troube. Help me out! 😖