A decidedly dangerous game

Paolo’s discovery and assumptions seeing Franco leaving Tony’s house after a carnal assignation with Marcia (surely?) led him to consider three courses of action.

Report back to Tony his findings and suspicions. That might shortcut the process, shortening Franco’s life dramatically, thereby taking Paolo off the suspects list. (Although Marcia might be punished... and inform Sofia... who might then tell Tony a different story)

Tell Marcia that Tony made him tail Franco, and why.

Or... Paolo could confront Franco and advise him to ‘disappear’, thereby avoiding gruesome death inflicted by Tony (but, importantly underscoring his guilt).

Or maybe all three?