Rereading Blums Gangland book after 20 odd years.

Why did WBJ stay in the area after it came out in the Giacolone/ Bergin crew case that he'd been a grass / rat for many years?

I read that Gotti swore on his dead kids grave(?) that WBJ was getting a pass but he couldn't be with them anymore.
Find it hard to believe that WBJ could be that trusting. Especially, when the alternative was death? (Was is it Pitera who shot him?).

Can you imagine how WBJ felt when Giacolone exposed him , at the bail hearing.
Whilst sitting with his co accused.