What makes you decide whether a guy is potential long term relationship material, or just a fuck buddy.
Theoretically, I'd know we were heading towards an LTR when I felt a serious emotional commitment and believed it was reciprocated.
In reality, this has only had a chance to happen in one of three LTRs. The other two happened too quickly to think about anything.
Can the roles reverse? IE someone who was once an LTR turn into a fb, and vice versa?
I only ever had one ex (LTR) want to remain friends let alone more. I did screw one of my other exes a fair few years after breaking up but he fell right back in love with me and I had to end it fast.
I think it would be POSSIBLE for a FB to become a LTR, but not terribly likely. After all, what was stopping you from going LTR before that?