He was a liar and a (quite literal) cheater.
We know hes a cheater, but is he a liar?
And ultimately, is he a criminal?

Credit: Jeff Neumann/CBS
(Later, bullets would go missing from evidence, which would lead to a mistrial.)
And when Alicia very quickly says no, Connor promises a surprise witness.
So naturally, Alicia calls Jason.
It seems the construction men had the floor wrong.
They were supposed to be on 18, not 28.
Diane thinks they should just expand to the 29th floor.
After all, its empty and theres a hole in their ceiling, so it really makes sense.
Canning assures her that so long as they dont come after Cary, Cary wont come after them.
But the real twist is that Canning knows the identity of the prosecutions surprise witness: Geneva Pine.
And according to Canning, if she testifies, Peter will go to prison.
Once again turning to Jason, Alicia asks him to find out what Geneva knows.
She says she needs time, and he seems fine with that for now.
He has work to do, anyway.
On the stand, Geneva claims that Peter stopped Richard Locke from confessing to the crime.
Alicia feeling nothing about the affair and then fake-crying to appease Canning.
Yeah, shes shed enough tears over Peter.
Alicia tells Diane to use the affair, but Peter wont allow it.
He for some reason swears it isnt true.
Diane asks her husband to testify and give his honest opinion in a manner that will help her.
But leave it to Lucca to save the day!
(I dont think Diane has ever loved anyone more than she loves Lucca in this moment.)
NEXT: Cary takes the stand
The bad news?
Outside the courtroom, Alicia essentially thanks him.
I never meant you any harm, she tells him.
But Cary simply states that hes there to tell the truth and nothing more.
He then asks Alicia, What are you here to do?
(If he had a mic, this is the part where hed drop it.)
After Alicia confronts Jason about the Geneva-Peter news, he agrees to talk to her after the trial.
Hes done helping Peter; its just too weird.
Instead, he heads to a bar where Lucca peers into his soul.
But if Peter doesnt go to prison, Jason believes theyll get a divorce.
When asked which scenario he wants, Jason doesnt answer, so Lucca does it for him.
She informs him that he has fallen in love and needs to stop playing it cool.
And I could not agree more.
Speaking of husbands, as Diane asks for Kurts forgiveness, Alicia preps Peter to take the stand.
Calling her out on sleeping with Will and Jason.
But as Alicia informs him, shes not the one on trial.
(Also, thanks for pointing out her fantastic taste in men.)
The next day, Peter gets on the stand and testifies that he did not sleep with Geneva.
But if it was for the good of justice, wheres the bad in that?
Well, thats for the jury to decide as theyre off to deliberate.
And in the meantime, Peter also has something to deliberate.
Connor offers him a two-year plea deal, but he has to decide before the jurys back.
Alicia takes it to Peter, who confesses … that he never liked wine.
All these years, he was more of a scotch guy.
As for the trial, Peter could take two years or he could go away for 10.
Alicia tells him to sleep on it, but hes made up his mind: Hes taking the deal.
And this is where I get angry.
And in a moment of weakness, she says yes.
She promises not to forget him.
But then her phone rings.
Guess what, Peter?
The plea deal is no more.