Well we know this much: Walt did everything he did for his family, or so he believes. He turned his back on his family and kept secrets. When his wife said "no mas," she left him and when he forced his way back into their lives, she did something reckless and almost entirely to hurt him.
Now Walt's in full meltdown mode. It's tragic, like watching a fish fly out of a fishbowl and flop around on the ground. You want to help it get back in its bowl, but you realize you're watching a TV show and the fish's world isn't in reality.
I don't know about you, but the first thing I thought was, "What does 'green light' mean?" Everything culminated really well at the end there. Walt was depressed, his wife cheated on him, he fired his lawyer, even the radio is reminding him what a terrible person he is - and way to go on the Donald Margolis re-reference, they definitely didn't have to bring him in again, but it was perfect timing to remind Walt of the awful things he did. I don't know if it was intentional or not, but there was a shot of the car driving up to the stoplight and you see the new, repaired windshield in place.
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