Well, they obviously are bestfriend in high school!! But, when Rachel's go to college, they split up. Then....they meet again since Rachel left Barry at the altar and went to New York, and, then they became roommates!!
Season 1
MONICA: So how you doing
today? Did you sleep okay? Talk to Barry? I can't stop smiling.
RACHEL: I can see that.
You look like you slept with a hanger in your mouth.
MONICA: I know, he's just
so, so... Do you remember you and Tony DeMarco?
RACHEL: Oh, yeah.
MONICA: Well, it's like
that. With feelings.
RACHEL: Oh wow. Are you
in trouble.
MONICA: Okay. Okay. I am
just going to get up, go to work and not think about him all day. Or else
I'm just gonna get up and go to work.
RACHEL: Oh, look, wish
me luck!
MONICA: What for?
RACHEL: I'm gonna go get
one of those job things.
Ep. 1 ~TOW Monica Gets
a New Roommate (The Pilot)~
RACH: Ten dollars an hour
for what?
MNCA: Oh, I asked one of
the waitresses at work if she'd help me out.
RACH: [hurt] Waitressing?
JOEY: Uh-oh.
MNCA: Well... of course
I thought of you! But... but...
RACH: But, but?
MNCA: But, you see, it's
just... this night has to go just perfect, you know? And, well, Wendy's
more of a... professional waitress.
RACH: Oh! I see. And I've
sort of been maintaining my amateur status so that I can waitress in the
Olympics.
Ep. 15 ~TOW The Stoned
Guy~
ROSIN: This is a great place.
How long have you lived here?
RACHEL: I've been here
about six years, and Rachel moved in a few months ago.
MONICA: Yeah, I was supposed
to get married, but, um, I left the guy at the altar. Yeah, I know it's
pretty selfish, but hey, that's me. Why don't you try the hummus?
ROSIN: So, Monica, what
do you do?
RACHEL: Uh, I'm a uh, chef
at a restaurant uptown.
ROSIN: Good for you.
RACHEL: Yeah it is. Mostly
because I get to boss people around, which I just love to do.
ROSIN: This hummus is great.
MITCHELL: God bless the
chickpea.
MONICA: (laughing) Oh,
God, I am so spoiled. That's it.
RACHEL: And by the way,
have I mentioned that back in high school, I was a cow.
MONICA: I used to wet my
bed.
RACHEL: I use my breasts
to get other people's attention.
MONICA: We both do that.
Ep. 17 ~TOW The Two Parts-Part
2~
MONICA: You okay?
RACHEL: Yeah.
MONICA: Really?
RACHEL: Yeah! Y'know, ever
since I ran out on Barry at the wedding, I have wondered whether I made
the right choice. And now I know.
MONICA: Aww... (THEY HUG)
(ENTER JOEY, WHO LOOKS
ON APPROVINGLY)
JOEY: Big day.
Ep. 20 ~TOW The Evil Orthodontist~
Rachel: Oh, Monica. You
are not still going over that thing.
Monica: This woman's living
my life.
Rachel: What?
Monica: She's living my
life, and she's doing it better than me! Look at this, look. She buys tickets
for plays that I wanna see. She, she buys clothes from stores that I'm
intimidated by the sales people. She spent three hundred dollars on art
supplies.
Rachel: You're not an artist.
Monica: Yeah, well I might
be if I had the supplies! I mean, I could do all this stuff. Only I don't.
Rachel: Oh, Monica, c'mon,
you do cool things.
Monica: Oh really? Okay,
let's compare, shall we.
Rachel: [Yawning] Oh, it's
so late for 'Shall we'...
Monica: Do I go horseback
riding in the park? Do I take classes at the New School?
Rachel: [Yawning] Nooo...
Monica: This is so unfair!
She's got everything I want, and she doesn't have my mother.
Ep. 21 ~TOW The Fake Monica~