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.

Gilmore Girls Quotes

Paris: (on asking Rory to run for Vice President) Because people think you're nice. You're quiet, you say excuse me, you look like little birds help you get dressed in the morning. People don't fear you.
Rory: Hey, I haven't been dressed by a bird since I was two.

Lorelai: Wait, close your eyes and breathe. I smell snow.
Rory: Ah, it's that time of year.
Lorelai: Can't you smell it?
Rory: You know, it's like dogs and high-pitched noises. I think it's something only you can smell.
(Rory sits down next to Lorelai and pulls a blanket over the both of them)
Lorelai: I love snow.
Rory: Really, I had no idea.
Lorelai: Everything's magical when it snows, everything looks pretty. The clothes are great. Coats, scarves, gloves, hats.
Rory: Thermal underwear, wool socks, ear flaps.