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

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.

Tradition is a trap. It allows people to stick their head in the sand. Everything in the past was so quaint, so charming. Times were simpler. Kids didn't have sex. Neighbors knew each other. It's a freaking fairy tale. Things sucked then too. It just sucked without indoor plumbing.