AITA for kicking out my sister's boyfriend from my house?

Mutually abusive relationships are kind of like unicorns, this I'd a common and pervasive myth. The abuser feel entitled to have their way all of the time and to mistreat their partner. They want control over every decision and give no weight to their partner's needs or feelings It may seem like mutual abuse because they both yell and fight, but the abuser causes discussions to become a fight. The abuser sees the world in black/white, winner/loser and does not have the emotional intelligence to communicate and hear their partner. For more info I recommend the book "why does he do that?" By Lundy Bancroft (can download free on Google docs I think).

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