What if it IS what my character would do?

[Democratus]

That's not the player's fault. He is playing his character the exact same way he's been playing that character for the entire game. He is being consistent.

It is always a player's fault if they chose to disrupt a game and spoil the fun for the rest of the table.

Better for a character to be a bit inconsistent, and figure out an interesting justificaiton for the inconsistency, so the fun at the table continues.

Later on, have a talk with the DM about the situation and your concerns with your character.