Agreed. I forgot to point out that there is nothing "sacred" about a BF/GF relationship.
Think about it.
1) If a girl has a BF, but likes you, she's probably not intending to marry the guy ... unless she's a headcase; in which case, you had better not plan on marrying her!
2) Engaged or married girls are strictly off limits. Sometimes they'll flirt with you or act interested like single girls would. Be a man and just say no!
3) A girl with a BF who becomes her fiancee only happens because the girl wants it. In other words, girls who are serious about their BFs will not date other guys.
If a girl has a BF but never tells me, and otherwise acts like a single girl, I don't worry about it. In fact, I #-closed just such a girl today. I overheard her mentioning her BF to somebody else, but so far I have never been able to get her to talk about her BF. She'll mention that she spent the weekend cleaning the house, or talk about her married sister and parents coming to visit for Thanksgiving... no BF. (In my case, in my Operation Anaconda, it's one down, several more to go!)
BGMan