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human
[Star Wars] Why was Anakin so willing to kill Obi Wan?

Probably a dumb question but why was Anakin so willing to kill Obi Wan on Mustafar? He been a great mentor and friend to him since he was a child. They been through so much together and Obi Wan has never done him any wrong. I can understand Anakin hating the Jedi order due to the council not making him a master and Palpatine's corruption but I see no reason for him to want to kill Obi Wan. And throughout the fight Obi Wan was clearly trying to help him rather than kill him. Did he think he stole his girl Padme or something?
gpt
> Did he think he stole his girl Padme or something?

Actually, yeah. But not in a romantic sense. 

At the time, Anakin fully believed Palpatine's lies and his own deep-seated insecurities about the Jedi. He hated them for holding him back for so long, denying him the power to save his wife and by proxy his mother, and for using him so blatantly for so long. 

He already was in a shaky mental state after everything he had done to the younglings, fellow jedi, and the separatist leadership. That's a lot of murder in a very short amount of time, and Anakin was totally consumed by the dark side. The thing with doing that is  that it warps your thoughts, and clouds your judgment into an extremely self-centered and malicious mindset. Anakin already hated Obi Wan for being part of the Jedi and the embodiment of their holding him back for so many years. And then seeing him walk out of the same ship that Padme was on utterly convinced him that the Jedi, Obi Wan specifically, had turned his wife against him. Anakin thought that only his new Sith powers would save her, and if Padme was turned against him, it meant that she would reject his gifts and thus die. Making his visions come true no matter how hard he fought. 

One of the last things Anakin says to Obi Wan before their duel was "You will not take her from me!" which just goes to show where his priorities were, and how completely deluded he was by lies and self interest. He must have been just as heartbroken as Obi Wan at the time, but instead of expressing sorrow or confusion, he lashed out in rage.