Is this FWB with my ex?

we talked and caught up for hours and its just a spur of the moment when we just started making out and he fingered me and I gave him a . Is this fwb? I don't want it to be bcause it was just spur of the moment and a one time thing. I just want us to be friends. Never have with him again unless were emotionally attach. Were adults too, i'm 22 and he's 19.