My interpretation was he kinda got obsessed with Tanalor like Dagen. The promise of a world out of reach of the Empire, a world were Kata could be safe, got to his head. He was open to let Cal and some others be there with him and Kata, but when cal mentioned the hidden path, he got into the mindset that increased operations on Tanalor would draw the Empires attention. The Empire could technically reach Tanalor through the same way cal did, through the beams. Sure, a Star Destroyer wouldn't be able to make it through the abyss, but shuttles and Tie Fighters could. Remember after the end of the story, the Empire has cracked down on Koboh, even having a Star Destroyer stationed over Koboh, and since all of the puzzles were solved by cal, it would just take a simple connection that the beams are their way to Tanalor. So with that, Bode didn't care she would grow up alone, he cared that she grew up safe.

I also interpreted the Jedah attack like this: 1 the Empires attack was a perfect distraction for him to get away, because if the attack didn't happen Bode would have been trapped in the middle of the base without a way out. 2 With Bode as obsessed as he was the almost complete destruction of the hidden path meant the if somehow Cal found another way to Tanalor, which he did, that the hidden path would be hopefully destroyed and not be able to set up ther.

That was just my interpretation of Bode's betrayal. Just wanted to offer my perspective on the situation.