莫妮卡和理查德的分手原因如下：

Monica未来非常想要孩子，而Richard已经有孩子了，不再想要孩子了

而且他们年龄相差太大了

对于Monica来说，婚姻，家庭和孩子是最重要的

所以就分手了

请看下面的剧本对话，是他们分手时说的，希望对你有帮助~

具体集数应该是第二季的24集，

MONICA: Hey, you know I got a question for ya. Just a little thing, no pressure.

RICHARD: Okay.

MONICA: Did you ever, uh, like, think about the future

RICHARD: Sure I do.

MONICA: Yeah, am I in it

RICHARD: Honey, you are in it.

MONICA: Oh God, you are about to get sooo lucky.

RICHARD: Oh, yeah!

MONICA: Keep talkin'.

RICHARD: Well, uh, sometimes I think about selling my practice, we could move to France, make French toast.

MONICA: Okay, so, uh, we're in France, we're making the toast. Do you see a little bassinet in the corner

RICHARD: Like a hound

MONICA: Not a basset, a bassinet.

RICHARD: You really need the bassinet

MONICA: Well, I just think the baby would keep falling off the dog. Do you, uh, do you , do you not see kids in our future.

RICHARD: Oh, hey. I love children, I have children. I just don't want to be 70 when our kids go off to college, and our lives can finally start.

MONICA: Uh-huh.

RICHARD: Look I want you, now.

MONICA: That's Great. You know we don't need to talk about this now. Really, I mean this is, is so way, way, way, in the future, I'm talkin' hovercrafts and apes taking over the planet.

莫妮卡未来非常想要孩子，而理查德已经有孩子了，不再想要孩子了，而且他们年龄相差太大了，对于Monica来说，婚姻，家庭和孩子是最重要的，所以就分手了