Is there a difference between a casual relationship and friends with benefits?

[bigapplejen]

I have been seeing this guy for about 10-months. It has been purely sexual, but we care about each other. In the beginning, we had sleepovers but now, we are not. I have heard that with fwb there is no emotional attachment whatsoever. While, most of the emotional feelings have died he still seems concerned about me (makes sure i make it home okay if i go out, asks how my Dr appt was, etc) Calls me pet names, texas/calls every 1-2 days, etc I guess these are things a friend could go, though so i could be wrong. I know we will never have a relationship, and we have agreed that if and when we find a significant other, that we will tell each other immediately to end it (obviously i wouldnt cheat) So, just trying to figure out what it is really.