If you called her and she told you she would call you back then the ball is on her side of the court. Overanalyzing your feelings isnt going to make her call you back. The best thing to do is hang out with friends and fill that emotional gap she created that way, or find another lady if possible. Either way, go sit down somewhere or take a nice bath/shower and find out why you cant stop thinking about her, do you want to be like this? It isnt bad to have good feelings about spending that time with her, but it is bad to create false feelings when overanalyzing what could be or what was. Be happy that you got to feel those things with her at the airport, maybe someday you will be in her town or something and you can get together again.
Be true to yourself, this includes taking a step back and realizing that the best thing isnt always the easiest thing in front of you.
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