What are some reasons why your mate, or significant other might pick a fight with you? How would you diffuse an argument to keep peace?

She would start fights about forcing our daughter to deal with loud noises and crowds when she was little. Our daughter hated them and would cry nonstop.

When our son was born she would starts fights about my job, my hours, what i cooked, my outbursts and me picking the kids over her..

We're getting a divorce so i guess i didn't diffuse them good enough.