What causes abuse to happen in a relationship? And how do you stop it from happening again?

This can include Any form of abuse in the relationship, whether it be mental or physical. Also if you are someone that has suffered abuse in a relationship what are Somethings that could've changed to prevent it from happening again and make the relationship between you two a better one?

And yes guys can speak up about being abused as well.

What causes abuse to happen in a relationship? And how do you stop it from happening again?
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