Buggy is extremely nervous. Leo must despise him for being so weak. God knows he despises himself. They'd promised each other Garp would never come near the children, that he would never discover any children they had after Leo, and he'd let the man raise their son and put him through the Hell Cobra had gone through and almost get their daughter as well.
It's been ten years since he kissed Leo goodbye, gave him his teddy bear, and told him to look after his dad and sister for him, and he's finally going to see him again after thinking he was lost to him forever for so long. He remembers Garp's rough, broken voice telling him his entire family is dead vividly. It's haunted his dreams for ten years, and never more than in the last few weeks. Why did he believe him? Garp had been lying, manipulating, abusing, and controlling people for thirty years by then, and he'd known that. He had no reason to believe him, so why did he? Why did he?