Aftershock

How can former bestfriends turned into boyfriend-girlfriend go back to being bestfriends?

I know I shouldn't have agreed with him to cross the line, even if I never wanted to be just his best friend since day one. I miss talking to him about everything and nothing. I wanted to tell him about this interesting person I have recently met online. I wanted him to tell me how happy he is with his amazing. I wanted him to be there for me. I wanted him to once again listen to my random ramblings as I did to him. Just the thought of us falling apart like this pains me. I wanted him to stay in my life forever. I would happily just take whatever he can offer me.