Pulp Fiction Question I’ve Pondered for 30 Years

So, Butch and Marcellus reach their truce after the “event” in the basement of the pawn shop, leaving Butch conditionally safe from Wallace’s retribution. Do we think Marcellus may have changed his mind after finding out Butch killed Vincent in his apartment, or would Marcellus just consider this the cost/risk of doing business?

Since it’s established that Marcellus and Vincent have a bit more of a professional relationship and seem to have some level of trust and friendship beyond business, would Butch ever truly be safe even if he stays out of LA?