Why didn't my mom tell me about his?

My boyfriend Bill came to my house and I introduced him to my mom. He immediately said “You are so lucky to have a gorgeous mom”. Then he said to mom “You look very familiar. Have we met before”? Mom said “no, I don’t think so”.

Bill went home and searched for mom’s name on the internet trying to find out if there was some event he was at that mom was at also. He didn’t find any but he found several of mom’s pictures on the Internet. He found out she was a model and had her picture in several magazines when she was younger. Bill printed out these pictures and gave them to me.

I had no idea mom was ever a model or that she had appeared in national magazines. She had never told me anything about this. Was I ever surprised. I want to put these pictures on the wall in my room with a banner that says “My wonderful and beautiful mom”. Bill told me to please check with mom before I do that. He said there is some reason she did not tell you she was a model.

Can anyone think of a reason mom did not tell me she was a model? I think the pictures of her when she was young are of the most beautiful woman I have ever seen in my life.