I know it is difficult for men to admit when they have been abused. I know one man who admitted to being physically abused by his wife. She would slap, push, and sock him in the face. She would do this if he didn't agree with her about something or if she didn't like something he did. He actually had to call the police to come get her because one day she just kept hitting him.
Then, there is also verbal abuse. I met a couple where the wife would just yell at her husband-- calling him names and so on until one day he just didn't come home. She does this with every man in her life. Some take it for longer periods than others. But they all leave. And she wonders why she is alone right now.
Neither of these women feel like they are abusive. What is a man to do? What is he allowed to do? If a woman hits a man and the man strikes back, our society sends the man to jail. Right?
Sometimes, I think men don't speak up about domestic violence for many of the same reasons some women won't speak up. But, a man is supposed to be king of his domain, right? So, I imagine a man would hesitate to speak up because it would imply that he is unsuccessful at being a man.