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

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.

Jess: Wanna play some poker? Five bucks a hand.
Luke: No.
Jess: Ten? I can't go any higher than ten.
Luke: Jess-
Jess: Okay, fifteen.
Luke: I don't want to play poker.
Jess: You sure?
Luke: Yeah.
Jess: Okie dokie.

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Gilmore Girls Quotes

Luke: Wait, you need keys.
Jess: No, I don't. (Leaves)
Luke: I so don't wanna know why.

(Dean and Lorelai watching through the window of Luke's Diner to Rory and Jess who are flirting)
Dean: Rory wouldn't lie, right?
Lorelai: No. Rory wouldn't lie.