I think the real question is what happens on your next trip alone, what happens next time you are in a similar situation for a prolonged period of time, what happens next time a man tries to flirt with you? And you dont have to be on a long flight for this to happen, it could happen next time you go shopping. Having once participated and enjoyed it, will you want to do so again? Will this be a once only experience or the beginning of a pattern?
Some possible responses to those questions could be a) I feel bad about this, that's my conscience telling me that it was wrong, so I won't do it again, and I'd better take some preventative steps to reduce the likelihood of it happening again. b) That was a test, I enjoyed it, I passed the test, so if the opportunity arises, I'll do it again or c ) I enjoyed that, nothing bad happened, I want it to happen again so I'll look for or create similar opportunities. B and C are dangerous choices. Any sort of action that releases endorphins often becomes an action that we want to do more of. For some people it only takes one drink to become an alcoholic.
Welcome to the forum, its a great place to get advice and discuss ideas.