She's naive but didn't she runaway so that her sister and fiance could be happy together? She's not sulking or exacting revenge its the naive "without me they can be happy" mentality. And let's be real being told ur finace is distracted and never even wanted to bridge the gap when she had never cheated on him is hurtful, that means if she had given up on juste her fiance would always be cold, simply because he is a cheater not that heaved someone else.

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She runs away bc her fiancé wanted her sis, and she wished for a love marriage, but is mad when her fiancé goes for the sis bc she was literally giving heart eyes to the ml (you were the one in the wrong girl ╥﹏╥)
She deadass asking herself why the fiancé won’t be intimate with her when she keeps showing him that she’s lovestruck with someone else.
Like you can’t be mad at him when you are acting like this. She is so dumb istg, acting obvious and all is not cute at all.
Also ml is shady af and the sis as something going on too but let’s see