I'm so sorry to hear of your situation, Lava_Twilight_x, that really sucks. :/
One thing I'm thinking is, that I think you're entirely right to feel shocked and confused, because he sprung this on you out of nowhere. I think it's really unfair that he had all this going on and never mentioned it to you, never discussed it with you, and just presented it to you as a fait accompli. I think that's vile and awful.
On the other hand he's young, and these communication skills can take some time to learn. I know that doesn't make it any easier, and I know you're still entitled to be kept in the loop even if it was nobody's fault that you weren't.
My first instinct is to go with what Ruth said and suggest that you use this time to focus on yourself. Build up a life for yourself which is independent of any single individual, and you may find that building your own life can give you confidence and satisfaction which you didn't know you could have.
Last night I was out with a friend who had broken up with her partner at his request, and she was miserable about it. But the second she started having her own life and her own friends and activities, he was after her like a shot apologising and begging her to come back. Personally I think that's really vile of him, and playing stupid games and stuff, but I also think that he's probably not consciously aware that he chases after the chase, if you see what I mean. Anyhow, they're back together now but not anything like how they were, she has her own life and her own friends and she seems much happier.
So if you focus on building your own life up with your own friends and your own interests, you may find that you have much more satisfaction which is spread out and less reliant on one individual, and therefore which is much more rewarding and consistently available to you. And he may possibly come back to you when he sees that you have so much more in your life than just him, you never know.
Plus there's that whole thing about if you love something, let it go, if it comes back it was always yours, if it doesn't, it never was.
You always will belong to yourself, so I think that's a good place to start. Meanwhile, I feel for you, and I wish you every happiness and success with whatever path you choose. And big hugs from me.
*HUGS*