Actually we were not in a relationship. To sum up the story, we were something like very close f**k-buddies but also had a good friendship (are honest to each other about our lives etc.). We didn't see each other for 4 years and she came to visit me from over 1000 miles far. On that day, I was tired and stressed and nervous for various reasons, had a closed attitude and I didn't have sex with her. She probably got very angry about that and didn't talk to me since that day (exactly two weeks today), didn't send me romantic text messages on my phone (used to send around 1 a day), doesn't greet me when I'm online on messenger.