Forgive this one incident and admire her honesty. Next time, dump her a.s.s
Tell her thank you for honesty and give her a big hug...
Forgive her, but tell her /show her that she can't take your kindness for weakness and that you would be forced to move on from her if she does it (or more) again. Keep an eye open until you feel that she is completely faithful to you
you are welcome! most importantly show appreciation for her honesty and reassure that she could always come to you if she needs something
One little kiss?
Give her a chance.
Get over it. Life is much to short to get hung up on such meaningless detail...
Mine did not stop at kissing. That was the end of that, sorry or not.
Tell her that you want to see her do it the next time she chooses to do such a thing... I must warn you though, if you go down this path she might get freakier than you are ready for. Be ready for lots of kinkiness should you choose this path.