There are couples that live together in Qatar that are not married. I think they have given you too much to worry about. So long as you don't broadcast that you aren't married you will be fine!
I've lived in Qatar for over a year now, I do not work. And guess what, I am not bored!
ooo was right we are all different people, therefore different attitudes about everything of course.
One can never truly know how they will feel about a place until they have lived there and experienced things on thier own.
I often hear how boring Qatar is on this site, however, I do not feel that way. Yes of course there are times when you will second guess what you are doing here but I don't think that is because you are in Qatar, I think that one would feel that way from time to time no matter what country you are in when living abroad.
Also I find the locals to be quite friendly. Maybe not make the first move to do so but once you do then they are quick to follow I find.
Good luck with your decision!
Charlene