There ARE relationship girls at night clubs. Most of them aren't but some are.
There are about 4 girls per group. Usually 2 of them are sluts and the other 2 are nice girls who are following along like puppets. 1 of them probably has a boyfriend. This leaves 1 girl per group who is probably a nice catch looking for a boyfriend.
Note:
-If you find yourself fucking a girl the night you meet her, forget about a relationship.
-If she is constanly talking about how hot all the guys are, forget about a relationship.
I met my girl at a club, she was a virgin, The other 3 she was with were sluts and normal dramatic bitches that come with tons of baggage.
I've been with my girl for about a year and a half. Best girl I have ever known and my solemate for sure.
You will know if you meet a relationship girl.
by the way, in regards to your last question, If you approach a group of girls by yourself, you are setting yourself up for certain disaster. I don't care if you are Brad Pitt, they will all look at each other and laugh.
Pick out a girl in the group, separate her from her friends, then talk to her, get her friends out of site. Otherwise, she will think that her friends think she is a slut for talking to you. If she can't see her friends, then maybe she will stop caring about whether they are looking at yall or not.
Girls are wierd like that.
good luck.