For me it was blidness. At Breakfast at Tiffany's 冬青, 冬青树 说 something like her greatest fear is not recognizing sometjing belongs to her until it's gone (I'm sorry I don't remember exact qote).
That's Scarlet's problem. She imagined she loved Ashley. She belived in it so deeply, that she wasn't able to recognize that 1) Ashley she admires isn't the real one, he's never existed. The real man is lost, damaged & pathetic- nobody she'd ever admire, 爱情 或者 even like. Her 爱情 was a projection of her mind and she was too blind to see it. 2) She was so busy with her imaginated 爱情 to imaginated Ahley that she missed the fact that Rhett is the 爱情 of her life: the one who supports her, protects her, understands & acceprt exactly who she is.She was taking his 爱情 but she was to blind (& egocentric) to notice it.
Of course, Rhett's pride was a problem in this relationship. But I blame Scarlet more.She couldn't devide her dreams from reality. She was too blind to see what's going on in her life, what she needs & what she's 给 all the time... She was rejecting it 年 after 年 in the name of a childish 幻想 until she 迷失 it...