Jess Mariano is Luke's troubled nephew that comes to live with him during season two of Gilmore Girls.  He's played by Milo Ventimigilia and is definitely a love interest and part of a love triangle between Rory and Dean.

Jess Mariano Quotes

Rory: Good night, Dodger.
Jess: What?
Rory: Figure it out.
Jess: Oliver Twist.

Lorelai tries to get Jess to understand that Luke is trying to help him
Jess: What are you sleeping with him or something?
Lorelai: Excuse me?
Jess: I don't know. The whole starry eyed 'you're so much better off, just give it a chance' speech. You're either really nave, or you're getting some.

Gilmore Girls Quotes

Dean: You said 'boyfriend'.
Rory: No! I just meant boyfriend in the sense that the whole defending me thing was very boyfriendy, but only in the broadest sense of the word, which doesn't even apply at all here.

(about breakups) I was thrown from a moving car once.

Babette