WATCH OUT!!! I SEE WARNING SIGNS EVERYWHERE!
Don't worry about your husband, he'll be back. He told you so. Wehre I see the warnings are:
1- Is that friend your friend? Mmmm. Put some thought into it. He knows you are married, right?
2- That kiss .... Besides being totally surprised and too shocked to pull back, what did you feel? DO NOT ANSWER TO ME, answer to yourself.
3- What stopped you from telling your husband right away? Fear? Is that worth digging more into?

Don't answer any questions to this post through this forum, they are just food for thought for you.

Best of luck, and don't feel so bad about what happened. This too shall pass.

gab