For worse or better...

I am dating a junior named Dylan. He is sweet and kind, definitely knows how to treat me. I’m a sophomore and he is obviously a junior. I am transferring schools and he is going to be at the school I am transferring to and one thing is, is he will be a senior in high school and I’ll be a junior so he’ll be graduating in May of 2019. He is going into the military. He has decided this and there is no changing his mind. I have no problem with that except for the fact that I have never had someone leave like that. So I am curious how I will deal with this. Ladies know any ideas about how to deal with this? Also when it comes time what should I give him as a going away gift that he can take with him when he leaves??