I dated a guy for over a month and never knew he had a daughter. He never brought her up, ever. Is this a red flag?

I once asked him if he wanted to have kids one day because I saw nothing filled out on his profile about it. And he never mentioned her. Another girl I know had to tell me about it weeks after we stopped talking.

I dated a guy for over a month and never knew he had a daughter. He never brought her up, ever. Is this a red flag?
Post Opinion