Why do they normalize so much toxicity?

I'm still shocked how they normalize threatening someone with suicide and jealousy. The lead girl revealed herself but because her boyfriend was jealous she became "ugly" again. How on Earth is this acceptable? He was willing to marry a girl he didn't love because she threatened him to kill herself and no one told her to see a therapist? I don't understand.
It was cliché and painful to watch. The acting was not bad, but the characters are annoying. The only good point was the music.
I guess you can watch this drama if you decide to unplug your brain, but if you begin to think about how problematic it is, you never stop.

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