In season 2 episode 12 of Breaking Bad, Phoenix, Walter let Jane die. He could have saved her but inspite stood there and watched Jane die.
What was the reason behind it?
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Sign up to join this communityBecause she was a bad influence for Jesse. Walter needed Jesse to cook.
Walt considers saving Jane, but ultimately lets her die, knowing that her death would help him gain control over Jesse as a result, and possibly stop Jesse from using drugs.
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It's important to remember the events that had just led up to that.
Any one of those is enough for Walt to want to let her die. He had too much riding on this for a junkie who could barely hold down her job to get in the way of him working with... some other junkie who could barely hold down his job.
Walter White is a man who will go to any extent to save his family.
To survive his family he needs to cook Meth and for that he needs Jesse.
And Jesse wanted/thought to quit cooking meth after he became intimate with Jane. So Jane is a threat for Walter.
Note that : Walter at first was compelled to save Jane but he didn't save her.
Over the phone, Jane told Walt that if he didn't give Jesse his money, she was going to turn him into a national news story: "High school teacher becomes meth dealer".
Before Walt handed the bag with the money to Jesse he asked "How do I know she'll keep quiet?"
Jane responded "I guess you don't".
Walt felt he couldn't trust Jane. That's why he let her die.
The other answers say that Walt needs Jesse to cook. I don't think at this point that's true. Walt isn't thinking about cooking at this point. He's flush with cash. He just had a baby and has surgery scheduled. There isn't talk of cooking until next season, and at that point it's Jesse doing the cooking alone. He returned to Jesse's house not to convince him to cook, but because he was generally concerned with the path he was on. It's clear in the very next episode when Walt pulls Jesse out of the drug house that he feels responsible for his condition.
The biggest reason is that she's untrustworthy. When Jesse says "He's my partner", she tells him she's his partner.
Jane proves this to Walt when she says he wouldn't know that she'd not expose him.
Plus, Walt couldn't afford to lose Jesse; he was his only method of distributing the meth that he'd be cooking in the future(later events say otherwise; but at this point, Gus was not really a factor in anything.)
I haven't finished the series yet so I'm not sure if the person Walt becomes, but from the person that he is I feel like people in this specific discussion are seeing him as very one dimensional. I agree that half the reason Walt let her die was because she was a threat to the business and he couldn't afford her ratting him out, and maybe part of that was her getting between him and Jesse. But I think a larger part was that he genuinely cared about Jesse. The only reason he went to his house that night was because Janes father told him he should never give up on 'family'. He feels a responsibility that he showed when he wouldn't give Jesse his money in the first place. He may have thought Jane was responsible for Jesse getting on heroin (even though she wanted them to get clean) and he was trying to also help Jesse out. (I obviously don't think he did the right thing.)
He let her die because he's a bad person at this point in the series. I think that's the first true evil thing he did. It was for selfish reasons, he'd rather have control over Jesse than save her life.