Now it is time to pretend that things never happen, and go on with the life.
Even though that u know that friend backstabbing u, without knowing it, when u know it, it is already too late, but u still have to pretend nothing have happened in front of him.
Don't look. Don't think. Don't listen. Don't say.
Sometimes it is the time to let it go, to overlook everything that is happening around you.