I agree with everyone who has answered so far, it is still way too early and it will be even harder because you are still having contact with him...

Although it is not easy, you need to find a way to accept that it is over. I suggest using techniques in which you can calm your mind, stop ruminating about him, and reconnect with yourself. I use mindfulness meditation but any meditation or yoga should help.

It will help you gain some perspective on the situation too...