All along
Definition 1 of 2
Pro Tip 1/3Time Revelation
Expresses that a fact was known secretly from the start. 
He pretended to be surprised, but he was aware all along.
Pro Tip 2/3Continuous Support
Indicates someone's unwavering support or presence from start to finish. 
My family was with me all along my journey to recovery.
Pro Tip 3/3Hidden Intent
Suggests that true intentions or feelings were concealed until now. 
They seemed happy, but they desired a change all along.