Maggie goes to Rust's apartment and seduces him, although it didn't take a lot, resulting in Rust kicking her out and never interacting with her again really, and Marty and Rust having that huge brawl in the parking lot and Rust quitting.
One of the reviewers was complaining about it at the time, saying they found it non-believable because Rust was so strong-willed.
At the time, after I saw that episode, I disagreed.
- I had thought I had detected some level of attraction between Rust and Maggie before, but Rust is very disciplined and Maggie faithful, so neither really responded. But they had a way that they interacted and a kind of "shared bonding" because both had to deal with Marty's bullshit. In fact, Rust was the only person who really grasped what Marty was doing to his marriage, who Maggie could talk to. So the seeds were there.
- Rust was obsessed with the case and had been suspended and locked up in his apartment, his isolation managed to INCREASE despite being so bad already. He was very very disciplined but very very hurting -- at this point, he had already lost two marriages.
- Rust had some disdain for Marty for cheating on his wife and not controlling himself, so "it was Marty's fault" that he was even in this predicament and he deserved whatever he got. (Note a later conversation where Marty and Rust are discussing "judging people" and Marty insists that Rust is always judging him even when Rust doesn't say anything, and Rust says people judge others all the time, that's what we do in order to make decisions, so if you want to be human you need to accept that.) Rust also had lost his wives + a daughter, while Marty seems to be taking them for granted.
- Note that Maggie might be trying to understand Marty a bit when she goes out to hook up (to put herself in his shoes) but is also trying to HURT him, IMO -- if he can sleep around, so can she, and he shouldn't take their relationship for granted. This is very obvious when Marty comes home and she's full of barely restained anger, leading her to throw her encounter with Rust in his face, triggering Marty to almost choke her (and when he restrains himself after she goads him on to hurt her and says at least then she would have some reason to explain to her daughters for their breakup, she calls him a coward... )
- I think this is what Rust picks up on right after they have sex... he realizes she was using him at least in strong part to get back at Marty / be a bartering point in their marriage problems, and this infuriates him... he's mad at himself for giving into desire and breaking his own standards, he's mad at being momentarily fooled by another human being, he's mad because what Maggie did was wrong and unfair to him (dehumanized him)... and this is why he flips out, screams at her, and tosses her out the door. (Note that Maggie's intent HAS to have been at least partly calculating, as instead of feeling wounded by Rust, she goes straight home and uses the encounter as ammo in her marriage fight; an "innocent" would have handled Rust's abuse differently, believing it to be unfair.) Rust feels so betrayed by her and mad at himself, in fact, that he pretty much avoids Maggie ever after.
That's what I got out of that episode. Of course, I think in the finale, Marty and Rust address the issue on the nose, and Marty tries to excuse Rust's sleeping with Maggie ("She said she seduced you, you really didn't want to") and Rust is like, "Everyone has a choice, Marty. We all can make our own decisions" -- refusing to be exonerated. He still blames himself for giving in and will likely never let himself off the hook.) I felt like it justified my reading of Episode 6.
What did y'all think?