so sorry to hear all this sammie.
this is the thing with psychics sometimes life throws us a curveball and nobody can predict that.
Check out William's video - he says sometimes we are in other person's life for their learning and not for us. If this guy is going back to his community, I am not surprised it is not easy to abandon such strong traditional ties and the non-traditional free world can be scary when there is so much security in the mennonite community.
Hey Sammie, focus on your spiritual growth and learning and have fun. Let this guy know you do not resent him for doing this and wish him the best in his life and his future. Of course you are hurt because you are feeling caring person.
Do not make any decisions live in the moment, if and when he comes back you can see how you feel then. You do not have to commit to the person who has his own insecurities to deal with. Also understand guys who are lost can come across as very selfish when the truth is they can only do things from the perspective they have. Later on looking back one may hold their head in their hands and say, 'what was I thinking?' But why should you wait for them to come to this realization.
Good for you for graduating from college coming from foster homes it is a big achievement. Also check out Casey's video and raise your vibrations to attract the person who is equal in caliber to you and deserving of you. And if you still want to wait for Elvin he is only going back to his community not getting married, so it is not the end of the world, there is still hope and even better is that you are free to play the field.