"be careful when doing something"

He smiled to his workmate who's fell on the floor. Many women like him, because he is handsome, rich, kind. He is very friendly to everyone, he is also smart. But it's just a mask. You are his girlfriend, He is crazy. He is so obsessed with you. All his Workmates don't know that you are his girlfriend. You're always at home because he locks you up. A lot of women trying to sleep with him