Does being the second one show you are the intruder?

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I saw this in a Facebook group post where this lady needed some advice on the way forward concerning her marriage.She had been married for the past one year as a second wife but only learned of her husband's first wife after she gave birth to her child.She claimed that her husband kept his first union as a secret and her marriage seems to be failing because there is no feeling of security. Her dilemma is her husband has since changed and there has been no communication between them since he claims to be too busy to get time for any talk.So she wonders whether to hang on with hopes of a better tomorrow though she seems like a stranger on her own because she knows no one of her husband's immediate family. Following keenly, most of the respondents were condemning her for wrecking the first wife's marriage.Others told her that even if she was unknowingly in a union with a married man, she ought to walk out since she already unearthed the secret.So does being the second wife in a marriage show that you are out to no good to the first wife?