Is it because of long distance or is his not interested in me?

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I told my crush over facebook messaging that i had feelings for him...he didn't reply for a while and then finally messaged me back saying he wanted to call me (internationally) so we could talk...

We talked and he said he had a connection with me too from. The past (when we used to live in the same state)

Then he said this " okay, say we started a serious relationship, do u think it would work long distance?" I said no..

I told him that i wasn't sure if i wanted to be friends with him on facebook because i didnt want to see him date other girls and he said i didn't have to worry about that...

At the end of our conversation he said "well i have ur number and were friend on facebook now.. so we will keep in contact... Bye sweetie."

The next day his sister (who he lives with) liked my photo on Instagram...

We talk four days ago... We haven't talked...

Why? Does he just not like me or is he not talking to me because of distance?