First of all, always find your best friend, which can kill boring time and fill a little inner emptiness;
Secondly, make good use of this time to improve yourself. You can study, do what you want, and then get together or get married, so it won't be so easy. The cause of learning is never plagiarism itself, and how much you pay always pays off. This is your own retreat.
The most important thing is mutual trust and proper communication. Don't turn each other into the most familiar stranger because of distance. Get together more when you have time.
I wish you lovers all get married!