That's part of it, Gabe, and that's TRULY awesome, but there's a little more to it.
Example: You are friends with a lady and a man who don't know one another. They meet. They get married. The guy has to unfriend you and you aren't sure why, but the woman doesn't.
You're happy for them because they are amazing together, and you rarely talk with them anyway, so it's not a HUGE deal, but it still kinda makes you feel wierd to know that someone had to cut you out of their life. Does that make sense?
I've had women friends whose husbands didn't want them to be friends with single ladies anymore either though, so I suppose it's no different.
It's just a wierd feeling...as if being a single person was like having a disease or something...