You do not know what might happen in the future when you are having this kind of relationship. Some think it is hard, some think it is easy but probably the thing is you have to trust each other's faith. You must give and take, accept the fact that he/she is not beside you. All you have to do is reminisce, relax, think about the happiest moment in your life with the person you love and pray for each other's safety.
This maybe the hardest part of anybody's relationship but definitely the best.