What you yall do when you love someone who doesn't love you back? How do you deal and live with the pain?
With great difficulty, trying to endure until the pain gradually lessens with time.
I know it sucks. Don't really know how to tell you to deal with the pain.
You could try to stay away from that person, to see if you could get some of that feeling to go away, as awful as that sounds it may help. It will be hard to do.
It differs with each person but it is always painful in some sense. Sometimes isolation is the key, seperating yourself from them does work with some people but mostly its just supressing feelings. If you meet them again your love could just reapear but in the form of anger, jealousy or even rage.
If this is a friend then seperating yourself from them is not a great idea, you may have to deal with the pain for a while but over time they will go away, or someone new will come into the picture that returns your feelings and all your focus will go on them.
Great friendships have been made out of unrequited love, it all depends on how the two of you deal with how each of you feels.
The Word of God - Surprisingly indistinguishable from one's own personal opinion.