Why did he do this for?

He messaged me saying he would keep our conversation a secret and asked me why I didn't want children and why I was afraid to have them, I told him it was due to preference, but I asked him to please keep this to topic himself but he called up my family and told them my preference about not having kids and they we're very upset with me for it... Why did he do this?
Why did he do this for?
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