Thoughts on FWB’s

Me and this guy have been FWB for about 1-2 months now. I ended it briefly because I wanted more (not with him specifically, but serious relationships in general) but now I’m back with him. We’ve gotten really comfortable with each other. He treats me to dinner occasionally which I appreciate, and he stole my Netflix account lol. I guess the point of this post is to ask if you are involved in a FWB situation or have ever been, what happened? How’d it end, if it ended? I keep expecting him never to text me after we hookup but he was kind of upset when I ended it before.