You can heal and recover from the breakup. You can get through the breakup.
The first step is to admit your ex isn't everything. You can live your life without your ex. In time, the feelings you have for your ex will start dwindling. In less than three months, you will have moved on with your life.
The situation you're living now isn't conducive to ensure you heal and recover from the breakup. You can't be living together when you're no longer in the relationship. This is because the more you see him the more you're hurt when you realize you're no longer together. In such a situation, you'll become depressed.
You have to talk to him about what to do about the situation of the two of you still staying together. You have to let him know that the two of you staying together is affecting you negatively. He can stay with a friend until he gets a place of his own.
I have written an article which guides a person how to heal and recover from a breakup. It's called 'Steps to Heal and Recover from a Breakup.'
After he moves out, don't contact him nor receive his call/reply to his texts. Don't accept to become close friends. You should act as casual friends. You should not keep some of his things in your room. Unfriend him from social media accounts and delete/tear or store his pictures far away. This is to enable you to heal and recover from the breakup.
Every time you think about him, snap out of the thought. Tell yourself that you're no longer in the relationship with him whenever you think of him.
Search for this article 'Steps to Heal and Recover from a Breakup.' It will instruct you how to get through the breakup.
I pray you will get through the breakup. Remember, your ex has to find a place very soon or stay with a friend of his. His continuing staying in your room will only aggravate the situation.