It might also suggest he was completely out of his depth and had no idea what he was doing. He might not have deliberately set out to hurt you but his flagrant ignoring of his ethical responsibilities and responsibility to work reflectively is his fault. In sorry you were caught up in this guy's selfish behaviour.

My new supervisor recently asked me about T1 and when I told her the story she said "It sounds like he formed a relationship with you that he couldn't handle.".

That's on him. Yet we are the ones that end up hurt. It's not fair.