what would hAVE had happen if i made the deal with Pegorino
You go to the docks in Alderney and end up in an ambush where you and Phil have to shoot your way out of a warehouse, then chase a truck to kill the driver. And instead of Kate dying, Roman gets killed at the wedding. Then you go on the exact same mission to kill Pegarino except Dimitri is with him and you have to kill both.
i followed the boat on the bike and then i hit a jump and got in the helicopter but he always blows me up
That's supposed to happen, you have to land on the docks of the Statue of Happiness's island before it blows and chase them on foot and kill them.