Why isnt he replying to message on Facebook? Please answer me no one is answering?!?

[Emily]

okay so i was talking to my guy friend for like 4 hours like but i thought he had a crush on me because he would:
- make me laugh
- he would touch my foot with his foot.
- he is always kind to me
- yesterday we were in quiz and he was like oh emily come and join me and he isnt like that with other girls.

Okay so i found him on facebook last night and i added him and he accepted me and then we talked on facebook for like 4 hours straight and today i tried messaging him and he isn't replying and it has said he has seen my messages at this time with the tick button and it says he is online but with his phone.

I dont why he is ignoring my messages because last night we were laughing on facebook and then today he is ignoring my messages.

I dont know what to do please help me because i really fancy him to but he isn't replying to me. What do you think? Can you give me advice? Thanks for answering. Emily.