<human>: We have only been dating for about half a year now, but a few months ago my girlfriend said that she feels like I'm her best friend, and that I'm always the person she goes to when she needs to talk about absolutely anything. Being the fairly insecure person that I am, I absolutely loved this, and it made me gain a lot of confidence.

About 3 months ago, however, a friend of hers (let's call him Mike) moved to a different city because of work. She thought she was losing him as a friend, but they solved this by both starting to chat on skype (just IM -- no voice chat) **a lot** during work. I noticed that she wasn't texting me as much anymore and that she occasionally seems to "forget" telling me about some things that are going on in her life. 

At one specific point when we were hanging out and watching a movie, my girlfriend got a text from someone at work that upset her quite a lot. I started comforting and trying to help (in general I am pretty good at that), but instead she just walked off, opened Facebook, and started discussing the whole thing with Mike instead. Then yesterday she mentioned something Mike had told her, and then added that she felt pretty good because she and Mike have become really good friends despite him living so far away.

In a normal situation I wouldn't have minded (and I would be happy for her), but I keep getting the impression that she no longer sees me as a best friend at all. To make matters worse, I feel like I'm being selfish about this, and I know that she'd be pissed off with me if I brought it up.

I'm not sure if I need advice or just some words of comfort, but any input is appreciated, I guess.

Give me a shortened version of the text
<bot>: My girlfriend seems to no longer see me as her "best friend", and I'm not sure if I'm selfish for being sad about this.