the end.

He ends up with dating Madison in the real world to see how it goes. I believe the surprise was if Madison and Peter would get back together, or get engaged, or go their separate ways. It played out like this:
Madison dumped Peter before final rose day.
With Hannah Ann the only one left, he proposed to her.
I guess a month later, after not seeing each other during that time, Peter broke it off with Hannah Ann.
A couple months after that, Chris went to ask Madison how she felt about Peter. She said she still loves him. Chris told Madison Peter still loves her, too.
She flies to L.A. to see Peter.
Peter is surprised, and they talk.
Two weeks later, Madison comes onto the finale show to awkwardly sit next to Peter and listen to his mom belittle her.
Madison and Peter decide to see where their relationship goes.

i hear you Daggerboard but if Peter did not want to propose to Hannah Ann then why did he?!

he should've told her like a human being that she ain't right for him and 'bye'
go chasing after Maddie.

obviously we don't know how much of this is the producers' writing but the guy was a douche from the start. there's no doubt he lacked backbone ; )

Barb is a mean and nasty woman. She was so mean to poor Madison. I don't think I like the woman....

It's really sad to me. I was really rooting for them...