I'm going to ask my bf to stay up with me to help me calm down
What does he need to calm you down from?
Sometimes I get so nervous about my exams that I can't calm down by myself.
There is nothing wrong with asking someone to help you calm down. Sometimes there are things that cannot be done on your own.
I like that I can depend on him.
It is good you are able to ask him for help when you are in need. It shows that you trust him and he trusts you.