There is no one-size-fits-all answer to this question, as each situation is unique and complex. However, here are a few potential reasons why someone might allow themselves to be bullied in a marriage or partnership:

1. Fear: The victim may be afraid of the consequences of leaving or standing up to their partner. This fear could be related to physical harm, financial instability, or the loss of the relationship.
2. Low self-esteem: The victim may have low self-esteem or self-worth, which can make it difficult to set boundaries and stand up for themselves.
3. Learned behavior: The victim may have grown up in an environment where bullying was the norm, and may not recognize it as unacceptable behavior.
4. Emotional dependency: The victim may be emotionally dependent on their partner and may feel that they cannot function without them, which can make it difficult to leave.
5. Belief in the partner’s behavior: The victim may believe that their partner’s bullying behavior is justified, or that they somehow deserve it.

It is important to remember that no one deserves to be bullied or abused in a relationship, and there is never an excuse for this kind of behavior. If you or someone you know is experiencing bullying or abuse in a relationship, it is important to seek help and support from a trusted friend, family member, or professional.