He'll have lost all hope. By that time, even Chris will finally realize that he'll never have a sweetheart, high school is over, and his life will never get better. And he'll be very bitter about it.
He will be a grouchy old man (yes, "old" in his early 50s because he gets no exercise and eats crap), who plays video games in a filthy run down house full of trash, occasionally emerging to get junk food, communicating only with fast food cashiers in mumbles and grunts, never making eye contact. Caring even less about his hygiene, it's all pointless if there will never be any sweetheart. Even his few ass-patters online have deserted him by now. He probably sees everyone as a potential troll, but even they have finally grown bored with him as he never does anything. Even playing with Legos just seems like too much trouble to future Chris. He still talks to Sonichu, but now it's sort of like Gollum talking to himself:
Sonichu: Christian... Why does he cry, father?
Chris: Cruel trolls hurts us. Megan tricksed us.
Sonichu: Of course she did. I told you she was tricksy. I told you she was false.