Finally someone who shares my takes on this!
Nick acting like a rat and spilling secrets doesn't change the previous behaivour of the rest of the frat.
In fact, I'm more on his side than anyone else since I could finally see someone actually stand up to insecure bitch ass Tommy.
Also on the Heather thing, he was used he and Heather said so themselves and we know it's true since Heather can admit to MC this very episode that she only came to the party to "make a statement" to Tommy. She's still hanged up on him. (Hilarious considering she will deny it when the MC says that from his POV Tommy doesn't look he cares for her at all.)
Hey, she might be as dumb as Fuckface actually! Maybe they are a match made in idiocy