#1 cause or reason the victim does not report the abuse is because they believe if they do, then things will become even worse that they already are.
Example: "He already beats me. If I report him, he could kill. He is more than capable. I don't want to die.
-Victim of Domestic Violence
2. Love. Many victims are abused by people who they care deeply for, and the abuser typically pretends like they care deeply for the victim. This causes a vicious cycle of violence, apologies, and forgiveness.
2. They may be afraid things can get worse if they speak to someone
Another reason why someone wouldn't report abuse could be because of a threat, for example: a guy made a threat to his spouse saying that if she told anyone he would hurt her family.
Hope this helps
and the Fear of not being believed