Let him go. Just let him go. I know it's going to be painful. Nights and alone times become poisonous and vulnerable. But, you got to face it. Things come with consequences and we're bound to deal/tolerate it.
Work upon yourself, take care of yourself because now you're all alone to be taken care of.
Get up, dust off yourself and keep moving forward.
Shed your tears daily, but don't forget to move ahead. Feel this pain, you'll come out more stronger and smarter. I bet you'll be a total different person after coming out of this storm.