Why does girlfriend WeChat have the official account of hotel WeChat? Only when I check in at the hotel?

Not necessarily. Don't doubt your girlfriend easily. Now many micro-signals will be promoted. Maybe a friend helped to promote it, or maybe it was added when I went out to play before. I think this kind of thing can be big or small. The most important thing is to see if you love your girlfriend. If you love her, you won't doubt her casually. Don't be too suspicious emotionally, or I'm afraid your girlfriend can't stand it.