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-What are your ages?
-When does he leave?
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I think you should really talk to him about that because he knows what he wants and it's important to always have the lines of communication open. Tell him that you have been thinking about possibly moving back to NY while he is gone and see what he says. It's important that you as a couple make sure that you are doing the right thing and that he really wants you to stay there while he is gone even though it's not far away. You are both 18 years old and I think you are having doubt because you are young yet and don't know if he will be able to still be committed to the relationship while gone for training but in order to get that question answered you will have to ask him. I think you should stay and show him that you will support him no matter what he wants to do in life but that is me he may saying something else and might want something different, so talk to him.