I have a few questions for you that might help me provide a better answer...
The first is, did you know that she was going to do this, and if you did not know, how did you find out?
I think that so much about your response to her actions is based on how you feel about her. Do you find her more desirable now? If so, is it because someone else finds her desirable? In my experience, when people respond as you did, it's because they see their partner in a new light. People who have been in relationships for a long time often forget that their partners are still attractive and desirable to other people. Sometimes, one night stands like this remind people of these things.
The next step is to think about where you go from here. Would you be upset if she did this again? What (if anything) does this mean to you about where you stand with her and what your relationship will be like.
Let me know what you think about these things, and we can continue to discuss this.
Thanks for letting me help you with this!
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