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Edward is a vampire and Bella human, duh!
Bella is stupid, but then again, so is Edward.
Bella is alive and Edward is dead.
Bella doesn't even know who she is in love with.
Bella is too complicated.
Edward is possessive, controlling, manipulative, emotionally and psychologically abusive, and belittles Bella's intelligence. I wouldn't care if not for the fact that Bella take NO action that this behavior is wrong! If he loved like he says he does, he wouldn't isolate her (though since she never VOICES her frustrations, he assumes this is okay).
Bella is stupid, she's ruining the Cullen's existence. (Note: Bella is said to be observant and intelligent in the books. However, the text doesn't back this up.)
Multiple times the Volturi assembled, it was because of her.(Note: the Volturi have been around for at least a millenia.)
Bella repeatedly manipulates Edward and Jacob for what she wants, knowing the way the two "feel" about her.
Both Edward and Bella expressed that they would kill themselves without the other.
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Edward's age isn't the problem, but he repeatedly treats Bella in a fatherly way, such as singing her to sleep, rocking her in his lap, etc.
Edward is sexist, manipulative and thinks he knows better than Bella.
Bella is too clingy and dependent on Edward (and men in general)
They have little in common and know nothing about each other.
They haven't really known each other long enough to want to spend eternity together; not to mention Bella is only a teenager - she is going to spending the next couple of years still figuring out who she is as a person, which may lead to some serious regrets about the choices she has made
Edward and some of his family members (i.e. alice) try to rule Bella's life, deciding how she dresses, who she can be friends with etc.
Edward practically blackmails Bella into marrying him, simply because she wants sex. They are both acting selfish here, not respecting each other's choices and also have very different priorities in life
Bella and Edward's relationship is described as being like drug addiction; they feel they need each other to be happy, but they are ultimately destructive for each other, which is an extremely unhealthy relationship doomed to fail
Neither Bella nor Edward are very honest with each other; they constantly lie or keep secrets on very important or serious issues
They constantly seem to be miserable in each other's company
Edward constantly insults or belittles Bella
Bella neglects her family and friends over Edward
Edward encourages Bella to ditch school, lie and distance herself from family and friends
A number of characters (Billy, Jacob, Jessica, Mike, Charlie etc.) see their relationship as being unhealthy
The entire book and movie are subpar and annoying cultural references.
In the book, Edward is acting like a man ready to punch his girlfriend because she doesn't listen to his rules, and this is absolutely serious, because Bella sees him as an angel from heaven and he is controlling her life as she is manipulating his heart.
Edward and Bella constantly vilify Charlie for being a good father and worrying over the obsession his daughter has for this boy.
Bella tries to force Edward to have sex with her.
Edward (and Carlise) try to make Bella have an invasive medical procedure against her will.
Edward alienates her from any friends she does have.
Edward stalks her.
Bella and Edward constantly ignore the rules that Charlie sets and mocks him for them.
They are obsessed with each other and not in love.
They declare themselves in love with each other after two conversations of nothing but small talk.
Edward manhandles Bella whenever he wants.
Bella doesn't truly know Edward. She didn't even know about his "strong belief" in religion until after six months of "being in love" with him.
Bella let's everybody carry her around like a doll and makes her self believe that they can do that because she is just "a puny little human".
Bella mentions multiple times that she is afraid of Edward's anger and that he will get mad at her for thinking things he doesn't approve of.
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