Meg - hang in there. A simple slip up is just that! Simple... and easy to pick yourself up and keep going foward.
Read my sitch - H did the very same thing to me. Started in with saying I had boyfriends all the time... and things like is that where you go with your boyfriend.
I like you would clarify that I have no boyfriend and I was there with co-workers (my H knows we only have women employees where I work)
I eventually learned just to say the truth - "No" and move on. I stopped clarifying it and adding more words. You will get there too!
