well guza strikes again and patty does cheat..

From TV Guide

GH's Fatal Attraction is the title. Picture of JT and BBr, toasting with drinks at MC. Picture of JT and BBR that looks like kissing on the side. Caption: Patrick and Lisa go celebrate pulling off a miracle surgery and wind up in bed, Brown says.
"WE CANT' SAY we didn't see this coming. But it's still a stunner. On July 2, General Hospital surgeons Lisa Niles (Brianna Brown) and Patrick Drake (Jason Thompson) will get drunk and hit the sack while his wife Robin (Kimberly McCullough) is away in Africa working with AIDS patients. That's not the surprising part. Lisa and Patrick were lovers back in college, so it was only a matter of time before th epast reared it's naught head. This is what throws us for a loop:

"Lisa is going to get very obsessive with Patrick and we will go into a 'Fatal Attraction' story," says the soap's Emmy winning head writer, Bob Guza. "This is not a Glenn Close sort of thing. Lisa is not a psycho. She wont be boiling bunnies, but that's not to say that she won't be acting out in a big way..."

(Article continues, but I'm not typing the whole damned thing)

After the article, there's also an interview with Guza, outlining it's a 5 person triangle because of Steve, Robin and Stone. He says that Robin is still hung up on Stone. "He was the love of her life and still is," says Guza. "If Stone was still around, Robin would not be with Patrick - and that's hard for Patrick to face. It's left him feeling very vulnerable."

According to the article, Lisa was never able to let go of her connection to Patrick, it's one night, he says it can never happen again, she tries to accept it and fails, Miserably. Paraphrasing Guza. Guza also plans to take his time with her going haywire and says "Patrick's refusal to continue [having sex] is not what sets Lisa off. Rather, there's a very small pyschological event tht will happen some weeks later. It gets her very perturbed."