All I can say is try to find something to fill up ur mind.. the more u think about it the more pain u will feel. No worries, ur still young, there are alot of beautiful things out there that u havent experience yet.. If he wants to go just let go, because his heart is no longer with you, well I think u oredi have a slight idea that this might happen someday, so I think u will have the courage to overcome this.