Sentence 1: Sal talked about all his coworkers behind their backs. 
 Sentence 3: All the other coworkers were there 
 Sentence 4:  They loved having a night out without Sal's negativity 
 Sentence 5:  Sal couldn't understand why he'd not been invited 
 Option 1: When Marie got married, she didn't invite Sal. 
 Option 2: When Marie got married, she invited Sal.