Okay , Help Me Out?

A couple things i neede help with.

Hello.
As you know i have a complicating life right now,
and to make matters worse...
1. My friend, no names will be mentioned,
decided to smoke when she couldnt handle it and cheated on her boyfriend
the cheating has been going on for  about 5 months now but yesterday was the worse...
:/
2. My boyfriend, the love of my life, is graduating high school and in 6 months he will be leaving to the military and i dont know how to handle a relationship without the person, there is no one else in the world that i want i want him and him only he is my life<3 ill wait those 4 years just for him, but any advice??
:/
3. This morning i woke up, and realized that my dreams are the only way ill be able to see his face<3 see him hear him and feel his touch, and i love it but it makes me never want to wake up from a deep sleep, cause im not seeing him everyday.
:/
4. I have a chance of passing, but very slim and im tired of failing over and over again
any advice?
:/
Not everything is bad, but i need help?