The unbelievable ending

Wow,  Double Indemnity was very interesting, but i was not so satisfied with the novels ending. Come on how can a good story end this way but not every story has a great ending.
Well, the third  part of the story starts off when Lola goes to Walter Huffs office to talk about what she thinks, she starts talking to him and explains how she truly feels about Phyllis. "You think Phyllis wouldn't be capable of putting my mother out in the night, in that cold, and keeping her locked out until she was half frozen to death- you think Phyllis wouldn't do that? You think she's just the dear, sweet, gentle thing that she looks like? That's what my father thought"( Cain 74 ). Not only did she kill her father but she killed her mother. Huff thinks to himself , " I had killed a man, for money and a women.  The women was a killer, out-and-out, and she had made a fool of me.  She had used me for a cat's paw so she could have another man, and she had enough on me to hang me higher than a kite   ( Cain80 ).Walter Huff starts getting very close to Lola Mr. Nirdlinger's daughter, Huff starts to realize that he is falling in love with Lola. Huff expresses " Lola, how sweet she was, and  the awful thing i had done to her"  ( Cain 80). " All of a sudden I sat up and turned on the lights.  I knew what that meant.  I was in love with her. ( Cain 80). At this point Walter Huff starts to feel guilty for what he has done to Lola's father he wants to set things straight but does not want to hurt Lola. Huff starts to think about the ugly witch Phyllis he was to do something about her because she knows about him and he knows about her and the only way he can settle the problem is to kill her with out her suspecting a thing. well everything end up not going the way he planed Walter Huff is the one that ends up getting Shot. At this point Walter Huff Thinks of Lola right away and he want to protect her he dosent want her to get Hurt so he confesses that he was the killer of Mr. Nirdlinger. Walter Huff and Phyllis should of received a different treatment because come- on they committed a murder not only did Phyllis kill one person but she has killed other people, and for her to get out that easy its not fair. Walter admits he didn't do the right thing and it seems that he learned his lesson and now he gets to be with Phyllis he should get some jail time for what he did . But for Phyllis she has committed a couple  of murders and she seems to not care at all she is a Psycho maniac Famme Fatale, that needs to live the rest of her life behind bars with no parole.