Most Helpful Guy
Yea, when you start saying things like "... questioning if this is going to work" just because of one missed day or after just a week, your doubt will carry over, then when you say "bye", maybe you don't mean it, but guys take that serious, especially after stating your doubt.
Contact him, tell him you didn't mean what you said that you were just in a mood or something, apologize then tell him you would like to go back. If you want to wait for him, let me remind you that YOU were the one that said bye.
On your part, don't say things you don't mean and understand that his world doesn't revolve around you only... yet. Because it will put you in positions like this. Lucky for you, an apology tends to solve all with guys.