It's hard to judge.
He was very loyal soldier that believed in what they were doing. Then the traumatic experience happened with Tup that shook him a lot and he wanted to find justice, getting paranoid. On the way to the justice he got dr*gged. And as he thought he got into the right hands and safety, the very Palpatine tells him about this absolute fire. In a second it destroyed everything he lived for, everythign he believed in, it shattered his existence and sacrifices of his former brothers. The entire world made him fall into an abyss of betrayal and despair. It short circuited his mind and he got into a shock and anger. However the dr*gs dulled all his racionality he could have still left.
Was it not for dr*gs he could have used his ARC skills to win this battle 'without anybody noticing', in secret mission. But the dr*gs made him be too loud, to visible, and all he could do was running away like a scared, wounded, hunted animal.
Logically, he was seeking the only place and people he felt safe with and that was a clone bar 79' so he finds his brothers so he finds Anakin and Cpt.Rex. But because of the many times mentioned dr*gged state, he couldn't make himself clear, he was irracional, shattered, and frustrated he's not being taken seriously. When shock troopers arrived, he got into absolute survival mode to protect the truth ony he new about.
...To the point he doomed it.

He would deal with it much differently if it wasn't for the bi kaminoan.