your thoughtless behaviour and words often hurt people
「あなたはよく人の心を傷付ける。」= You often hurt people / You often hurt people's feelings
「あなたの心無い言葉や行動は人を傷付けるよ」= You often hurt people by what you say and do / your thoughtless behaviour and words often hurt people
ボキャブラリー
「傷付ける」= hurt ~ / hurt ~'s feelings
「行動」= behaviour (アメリカ英語のスペル: behavior)
「言葉」= words/the things you say
「心無い」= thoughtless / inconsiderate