I have been in a relationship with my girlfriend for 4 years now. We met each other during our undergraduate studies. We've a great time over the past 4 years. After graduating, I went for higher studies and she took a job. Now we live very far from each other (over 2000 miles). So, it is long distance relationship now.
Last week my gf watched a movie till late with a colleague at their office. We talked over phone after she came back. Naturally, I asked her the reason for watching movie with her friend till 2 am. Initially she was very cool about it and explained that they are just friends and that nothing happened. However after some time she started crying. She confessed that she felt attracted to her colleague and even fantasized that being in a relationship with her colleague will make life so simple for her. She said that she feels very lonely in a new place. There are mostly men in her office and most of them show interest in talking with her. She said that this is very distracting for her and sometimes she feels tempted to spend time with these friends.
I was completely shocked as this happened completely out of the blue. Later on, she explained that this was all a big mistake. She apologized and promised that anything like this will not happen again. This kind of situation could have happened with me as well, but her telling me about it and then crying has made me anxious.
I believe everything that she has told me. But this small experience has made me very uneasy and suspicious. Every time she is in her office, I feel scared. I love my gf and don't want our relationship to fall apart because of some stupid incident. How should I deal with this situation? What should I say to my gf and what I can do (or ask her to do) so that she feels less lonely? Also, what should I not say/do?