Guy's Behavior

Why do men (32M) become so different after a breakup with their girlfriend (34F)?

My brother broke up with his girlfriend a few weeks ago. Our whole family loved her and she was such a sweet wholesome person. I was at their house just a few days before. They were all over each other telling each other they love each other, especially my brother. He was literally hugging her and telling her how much he loved her. ( I was outside with the window open).

They were so happy. Then two days later he comes over saying he broke up with her and acting like she meant nothing. He refused to tell us what happened, just that she was crazy. It's so far from the way she is though. He was the one we always had to tell to calm down with anger.

Since then he literally acts like she didn't even exist. He started talking to his ex wife the next day, and started dating and following inappropriate women within days.

He looks like crap every time I see him, and he just says he can't sleep. He tosses and turns and only sleeps 2-4 hrs a night if he can sleep. He says he doesn't even think about her when we ask and says he's happy.

We all see him on Instagram all day and night including when he's at work and following and watching extremely derogatory and sexual videos (we can see his likes). Videos that are so far from the way he was taught to respect women and so far from the way he was with his ex.

Aside from the sexual videos, a lot of them are demeaning towards women and "teach" men how to pick up / treat women on tinder or on the streets. These are Andrew Tate, sleaze bag style, if that makes any sense.

She did everything for him and practically worshipped him, so our whole family is sad for her because of his behavior and sad for him because he was so happy.

What happened to my brother after the breakup?

Why do men (32M) become so different after a breakup with their girlfriend (34F)?
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