Need advice to give. Bachelor got caught

I’m gonna post this on anon just because. But, I need help.

* long*

My best friend is getting married in one month. This past weekend was her fiancés bachelor party. They have history of cheating and all that. So she asked him to not go to a strip club, she’d rather him blow money somewhere else. She was also a stripper before and he knows he’s accepted and all of that. So they, knowing what goes on, promised the night before he left that he wouldn’t go. Fast forward to yesterday.

I’m hanging out over there,

He’s on the phone and she’s asking him all these questions

He’s denying doing anything, denying going to the back room, denying talking to anyone - we all know that when a guy is black out drunk and there’s naked women around, shit goes down.

Mid convo, he fucks up. Truth comes out.

He said- at first- they came up to him and he told them no.

Then

He says he was in a room by the door with his vape in one hand, beer in another and other guys standing around.

.... by the dooorrrrr.... is where he got caught.

She asked him “so how did you get into the room? You followed the girls”

He said “wait what?”

She asked again and since he knew he got caught in a lie, he admitted to it, “yes but it was only 2 seconds” but then started going on saying they were ugly, mumbling over his words, says something about prices, and she FREAKS. She throws the tv, and freeeeaks.

She wants to not get married to him because and I’m trying to calm her down. I was there, caught the lie with her, and I believe she has every right to be angry.. but I don’t know if it’s reason enough for the wedding IN ONE MONTH to be cancelled. Ladies, I need help to help her.

** edit to add; she also played her part in cheating too. But she says once he forgave her, her slates been wiped clean..