DEAN: I’m a saint, but I’m not mad.
RORY: Thank you.
While locking lips with Rory against a tree, Dean suggests that since Lorelai is away, he should come over. It’s possibly code for “let’s get sexy” (and Rory and Dean are more than a year over the age of consent in Connecticut), but to his surprise, Rory explains that she has plans to spend some time alone. She is afraid that Dean will be angry with her – she’s very scared of his temper.
Although disappointed and confused (the idea of a girl deciding to spend time alone for one night is beyond his ken), Dean kindly allows Rory the chance to do laundry in peace, as long as she “makes up for it” by spending all the next day with him. And then declares himself a saint for this outstanding act of munificence. Saint Dean, the patron saint of understanding boyfriends.
Note the touch of red Dean is wearing under his jacket, as if there is actually an underlying anger there.