While Lorelai and Rory are having Friday Night Dinner with Emily, Christopher decides to show up – no doubt encouraged by Emily, who has had a cosy little chat with him over the phone, and tried to make Lorelai get back with him.
Christopher doesn’t actually have any ideas on how to change the situation – he just wants Lorelai (and to a lesser extent, Rory) back in his life. He makes it clear that he wants Lorelai, not Sherry, but isn’t willing to break up with Sherry. In fact, he tells Lorelai he plans to marry her. I feel as if Sherry deserves to know all this before she commits to marriage and motherhood with Christopher!
I’m not completely sure what Christopher hopes to gain by seeing Lorelai – presumably to make friends again, with the hopes of one day persuading Lorelai to become his mistress, bed buddy, or booty call.