I think that when Skeezy Cheater HAD the affair, the horse was already out of the barn, and Ramona already knew more than she wished she knew. She could probably look back and remember things he had said and realized that she should have been able to read between the lines.
A lot of times, we tend to tell ourselves that the person was just kidding or just joking, but I think that is just to save face with ourselves....if that makes sense. We just don't want to believe it. Anyway....that's my take on it. I think Prism should tell you what she meant, since it may not be the same thing, but it is her post.
I've always gotten this weird tingly feeling down my spine when somebody says something that just doesn't quite seem right, and I should really be listening, regardless of what I've said in response....and it sticks in my mind, like a sore thumb.