Long Distance Relationship

So basically I’ve been dating this guy for a few months and we are super serious and like I’ve met his family, gone on vacation with them, gone on vacations with him, it’s all a Dream and it’s all perfect.

He graduates college in May, and since before we were official he told me that he wanted to finish college and then go to Germany to study German for like 8 months.

I thought wow that’s cool, if we are still together when the time comes I’m gonna be sad but that’s his dream and then after we can be together again.

But now a few months later we have not talked much about his trip and if anyone brings me up concerning the trip or what ever he gets really quiet and nervous...

And before, he told people that he was just going to study german, but now he is telling people that he is going to study german but also get a job there and stay there for as long as he can or until he wants to come back....

Idk what to do or say, this guy is amazing and everything that I’ve dreamed of.... but with everyday that gets closer to August (when he leaves) I just feel more and more anxious.

Yesterday I asked him how many hours ahead is Germany from Mexico (where we live) he said 7-8 and I was like well I hope you like early morning or late night Skype calls haha and he didn’t even respond.

What should I do