FWB....is it or isn't it?

so ive known this guy for a few months... and now we have digreseed to FWb... thing is it often feels more relationship than FWB... he invited me and i went to his neices 1st bday party over the weekend and met the family... to me that is not FWB... now i haven't heard from him this week... it felt like we were getting close last week then poof he disappears for a couple days...whats up with that...