Saying the wrong name

I have a really good friend (we're just friends, nothing more) called Sarah. I used to like her, but I decided that it'd be best long term just to stay as friends. But are we best friends in the sense that I tell her everything, and have a great great friendship with her.

Anyway tonight I was out with another friend, and I couldn't stop calling her Sarah. It was really weird, whenever I said her name, out came Sarah instead. Thankfully, she saw the funny side in it, but it really freaked me out. Almost every time I said Sarah (about 7 out of 9 perhaps)

So to the psychologists out there, I'm wondering. Does this mean I still have feelings for her that I've just possibly suppressed? I should imagine it means that I think about her an awful lot, I don't know really. Does anybody think it means anything, or have any ideas to try and stop myself from doing this happening again?