Please stop trying to contact him. I think it is clear that he isn't as interested in the flirtation as you are.
I'm sorry to be so blunt.
Guys want to be the one to chase. I know that sounds sexist and all that but it is the way they are wired. I can guarantee you this guy would call/text/write/message & see you, if he really wanted to. Better to let him come to you. And remember this for the future. The guy wants to be the pursuer. Always.
In the meantime, get busy with other things. I wish you the best...