Comey has been a hack for the Clintons for a long time, going back to Whitewater days. But he has managed to maintain an appearance of being above politics somehow, and that has been his political currency. It's allowed him to rise while behind the scenes he does what he can to insulate the Clintons whenever he can. He cherishes that reputation and has (it seems) imagined it might help him rise even higher.
And in one day it was obliterated forever. He sold his soul and everyone saw him sign that deal with the devil on live TV. He will never hold another high position in government again, he certainly know that now. Now he flails around and looks ever more the fool. I hope he is suffering within.