That my friend is what's known as a player. Better to find out now. Doesn't help the hurt your feeling at this moment though.
I wish I could say something profound that would make it all okay but it's your inner voice that must do the calming. As strange as it may seem, I believe this has happened for the betterment of you and him in the big picture. Life gives us what we need. I believe this will help you both grow, though it doesn't feel like it this moment.
What I can say is that your emotions are not you. Notice them but don't become them. Does that make sense? Take it easy, and breathe deeply and release your emotions. Stay cool and calm and lovingly tune out the chatter of your mind and once this is achieved.....listen to your innervoice. Your next adventure is waiting. You already know what it is. You just can't sense it yet, but you will and everything will be okay.