“I had one.” Again, Connor doesn’t elaborate: his ‘one’ is merely a fact. A statement that he understands, to some degree.

From what Glenn is saying — using past tense as well as the fact that he is here in Panorama, presumably much like Connor — he assumes that those two people are gone. Perhaps long gone.

“If I were to go a long time without meeting another kind person... I imagine that might distort how I feel. Distort my memories of that good person I once knew. I hope I never get to that point.”

Not that Connor has power over that, really. Power over who treats him kindly — with some manner of affection.