Outside advice!!

Hey all,
I'm currently going through a super weird period (in life right now). My boyfriend and I are "taking a break" I know, I know. 
We've been dating for two years, and I moved in almost immediately and if was comfortable from the rip. I'm 23 and he's turning 28. Now I graduated school, got a big girl job and I feel like I can't do it. He's been nothing but wonderful and accommodating. I just want to be single - not to fool around with anyone... just to do me.
Someone PLEASE tell me you've been there. What happened? What did you do?
Give me your experiences!