I do know a car represents your life journey. eg if you are driving and in control you are in control with your life. if you are p
Out of control esp if someone else is driving it implies things out of your hands.
Dont think this helps but the other girls have given you heaps good interpretation.

sent via my vortex manipulator
So maybe the friendship is coming to an end, and, it's out of your hands. Maybe you don't actually need to do anything?

They say ending a friendship can be harder than a relationship. I hope whatever happens, happens smoothly for you