If I might offer a suggestion: instead of worrying about how he might feel, ask him how he does feel?

[The one real good thing that happened in the past two years is that Stanford Pines has... well, not mellowed exactly, but he's had two more years of self-examination. He's still not perfect and he probably never will be but he's managed to grow at least a little in that time and that's something.]

I know Munchies and something tells me he's not the type to hold a grudge.