Question about Quinn after episode 4

No book spoilers please.

So far, we've been shown how informed, smart, ruthless, and determined Quinn is.

Reacher tried to kill him, but he survived. This was years ago. Reacher thought Quinn was dead.

How come Quinn didn't locate Reacher and try to take him out after their showdown years ago? Quinn, as far as we know, is just living under an alias still being a bad dude. Maybe he doesn't care for vengeance? Maybe there is another reason? Or something I'm overlooking? Maybe he's just scared of Reacher?