My problem is that Im not in a relationship and neither are the 'friends'. Im young and elements of families or marriage/jobs doesnt factor.
They arent busy, but 'selectively' busy for me....
Hm, has there been like a 'rift' or some event that triggered it?
Or they started going clubbing a lot and you prefer quiet music and staying out of loud bars?
It would help to know the age group too: 15-18 or 18-21 or...?
Also, you might wanna look at your communication with them. Are you critical a lot/venting/lamenting, or are they and you're not? Are they very much into pursuing girls/boys and you're too shy for that? (This could be a factor too...)
Basically, might wanna look at any differences between them and you, and also to look up effective communication (some good books and websites out there)... Maybe you've been unconsciously doing something that was not so good for communication..
A girl I know started dating one of her ex's best friends and then wondered why he hasn't got any friends and only stayed at home, or with her, most of the time..
So it could be something like this, or just clashing dating interests... (For example, someone else likes the girl/boy you like too.. and that person may seem to like you better.. etc etc)
Also, some people may like smoking and drinking and cussing (or a particular music style) and some don't..
Lots of things can happen.. You can either look for reasons and try to fix things (if they are fixable), or look for new people to hang with.. (or a bit of both)