Ok... spoiler below for anyone who hasn't seen the show yet....
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At the end of the last season, Joey was in the hospital room alone with Rachel and had knocked an engagement ring out of Ross' jacket pocket (Ross' Mom had given him the ring I think). Joey knelt down to pick it up and it looked like he was proposing to Rachel. Rachel said yes! Joey was stunned and didn't tell her that he didn't really ask her.
Then there was a whole comedy of errors and misunderstandings between who thought who was engaged.
Joey kept trying to tell Rachel that he didn't propose, but he kept getting interrupted.
Monica finally found out, and asked Rachel if she loved Joey and if she really wanted to marry him and she said "no."
Ross then found out what was going on, and Joey came in the room, and everything got straightened out (mostly

). Ross said that he hadn't wanted to ask Rachel to marry him, but that he did want to ask her if she wanted to start dating again. They sat on the bed with Emma and held hands and Rachel said "maybe" and things were looking good.... until....... Ross looked down at Rachel's hand and noticed the ring was on her finger, which meant that she had said YES when she thought Joey proposed to her. Ross had a stunned look on his face, and it cut to commercial... until next week....