Professor said we should meet again, but never answered my email
Based on my experience with professors, he's probably just overloaded with emails and either missed your messages or hasn't had the time or energy to reply, since it's probably not high on the list of priorities for him.

Assuming he's a professor at the university you attend, you could try just stopping by his office and hoping to catch him there. I did a similar thing once or twice during university and it was generally successful if the professor happened to be in. (If he's in a fancy office with a receptionist you could even ask the receptionist what hours he tends to be in the office, or ask them to pass along a note.)