How bad is the silent treatment?

I honestly didn't have idea about silent treatment I just left her because she did hurt me in bad Way when i Left her she sent me message I ignored her then she started to post like love songs on her page it was obvious for us... Then qoutes like I wish you back etc.. back ! Really no she's wrong I won't back. Now I have read here n there about silent treatment that its bad how bad ist
How bad is the silent treatment?
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