Chandler亲了Joey的约会对象：over the line

- When you were late last night, Kathy 

   and I got to talking. And one thing led

   to another, and...

- And what? Did you sleep with her?   

- No, I just kissed her.

- What? that's even worse!

- How's that worse?

- I don't know but it's the same!

- I'm sorry. But there's nothing I could 

   do. I think I'm in love with her.

- Who cares? You went behind my back?

   I would never do that to you!

- You're right. I have no excuses. I was 

   totally over the line.

one thing leads/led to another

事情一件接着一件；一件事导致另一件事

be in love with sb  爱上...

go behind one's back 背着某人做...

(1) I can't believe you went behind my

    back and gossiped about me.

(2) He will be upset that we've gone

     behind his back and made the

     decision.

I woud never do that to you. 

我绝不会那样对你

How could you do that to me?

你怎么可以那样对我？

excuse  (n) 借口

be over the line  越界，过界，过分

step over the line

cross the line

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