What would you do if your best friend almost got you shot?

Even though we don’t hang more than twice a year nowadays, my best friend since elementary school, “Y”, asked me to be the driver for him and another guy, “X”, in a robbery. The target was some deadbeat, wife-beating, drug-dealer with around 60K under his bed that X knew. I told him I’d think about it, but there was nothing to think about.. I didn’t know how to say no, I was so disarmed by the question.

Turns out it was good I stalled, because Y found out through the grapevine that X wasn’t planning on sharing the loot. He was going to shoot both of us, and run with the money. I haven’t talked to Y since. I’m feeling some tension about the whole thing from my girlfriend, who I couldn’t (and wouldn’t) keep out of the loop.

I like Y, but damn… Thoughts?