He added me on Facebook but never talks to me

I met a guy at a bar and he is 3 1/2 years younger than me. We made out that night at an after party. He was so drunk he fell asleep. I left my number on a little paper next to the bed and left. couple of days later he found me on Facebook. I said hi and he answered me like 2 days later and he hasn't talked to me since then. why adding on FB and not texting or calling and why not talking to me?
He added me on Facebook but never talks to me
Post Opinion