Im somewhat of an expert on this subject. Me and my ex have been on and off FB's for 4 years and counting. I was FB's with the chick
i dated before that for close to a year. I fvcked them both in the same day once, actually.
How does it happen? Not sure. The four year girl is totally BPD, and cant move on. She's rich and gorgeous and we always had amazing sex. We have this insane lust for each other, but we are totally incompatable in every other way. Two weeks ago we had a fight, and decided to stop being 'freinds,' because she felt that I only used her for sex, and I felt that sex is the only worthwhile reason to have her in my life. Yesterday, she blew up my phone so many times, I eventually picked up, and we ended up fvcking four times. What a hypocritical *****! From the minute i picked her up she was talking about how we should always be fvckbuddies, even though we can never be together.
The chick before that is different. We were never in a real relationship,a nd she kept cutting me off, because of her own issues, and we'd have 'extracurricular activities' once or twice, then befoer I knew it, we were back in our non-relationship. After we both moved on, we talked, and became friends, and there were a few times that we were both going through breakups at the same time, so we'd 'help each other out.' She eventually had a kid with a guy, so we dont do it anymore.
Basically, the best way to do it is to be 'freinds.' It only works if there is still attraction on both parts, but both parties understand that a relationship isnt happening. It also helps if they're the slvtty type that stay single for a long time. Its also imperative that you are great in bed, or there is no reason for the girl to do it.
Me and the girls sort of know that we dont work in LTR's, but we also realize that we have great sex, and why should we deny ourselves that?
It ALWAYS gets wierd on occasion though. jealousy happens, and one party wants more than the other, etc. When that happens you just back off for a month, and try again... or in my case, wait until she begs for some action.