My bio mom that abandoned asked me for the honest truth and I have it to her. Is that bad (please read)?

My bio mother who left us and cheated on my dad is trying to get together and be friends with me and ask why we won't forgive her. I told her straight up that if she was a REAL mother, she would have not abandoned us and be very selfish. Then I told her, "I don't want you to be my friend, I wanted you to be my mother which you will NEVER be!" sorry but my mom asked and I have her the truth. Is that bad? She didn't message me back after that. She left my dad heartbroken. He really loved her.