The giver Why did the giver say forgive me?

Oh, dude, the Giver said "forgive me" because he was about to give Jonas some intense memories that would probably mess with his head a bit. It's like a warning, you know? Like, "Hey, sorry in advance for the emotional rollercoaster I'm about to send you on." So yeah, it's just a heads-up from the Giver before diving into some heavy stuff.