I am a girl. The eight-character fortune teller said that my concubine seized the right to wife, loved her but didn't love her, and was good to her husband. What does this sentence mean in modern time

I am a girl. The eight-character fortune teller said that my concubine seized the right to wife, loved her but didn't love her, and was good to her husband. What does this sentence mean in modern times? To prevent mistress from being superior or her husband having an affair, mistress is more important than you in your partner's heart, and you are better to her than yourself, and you are better to your husband and pay more, but your husband can't tell these things, so you belong to the situation of self-sacrifice, and you are somewhat helpless.

There are also some ways to crack it, depending on what it looks like.