Why are so many of you scared to ask the person you're dating if you're exclusive

CC

or in a relationship? I've seen too many posts trying to figure it out based on little clues and subtle signs. You say "he's acting like I'm his girlfriend". Why aren't you having a conversation about it? Why assume or guess? I don't understand. I mean it can be a little daunting in case he says he's not on the same page, but I think it's scarier to go on not knowing at all, and being surprised or upset later, after more time together, when you're in deeper.