Since the premiere of "Suits" season 4B, Louis Litt has been tagged as the main villain of the show. He discovered Mike Ross' secret and has used it as leverage to be named partner. Now that he is, he also signed to an agreement that he is now a co-conspirator to Mike's secret. 

Still, even if it looks like Jessica and Harvey won a big part of the battle, Louis' anger and rage continue on. He is still very unforgiving of his peers, even with Donna and Rachel. It is actually a wonder how he can be angered this much. What happened in the past that led to his sour relationship with Harvey? 

Well, that's exactly what fans are going to get in the next episode. Season 4 episode 13 is titled "Fork in the Road" and it is a flashback episode.

The promo shows Harvey and Louis back in the day and, at the end of the preview, Louis says, "All I had to do was…" and Harvey interrupts him saying "sell me out?"

Is that what happened? 

The official synopsis for "Fork in the Road" goes:

"Harvey and Louis are going to travel to see a client to whom they have deep ties; and Harvey will take advantage of the time to force Louis and Mike to confront their trust issues. In other events, in a flashback, the root of Harvey and Louis's competitive relationship will get explained; and Mike is going to learn the limits of his intelligence when it comes to the law." 

But aside from Louis and Mike trying to move past what happened, Jessica also has to deal with her lies to Jeff Malone. Louis could not care less about Jessica and Jeff's relationship and Harvey believes when Louis starts blabbing his mouth again, Jessica will be in trouble with Jeff. 

"Suits" season 4 airs the new episode this Wednesday on the USA Network.