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human
[Avatar - TLA] How did Aang unblock the final chakra at the end of season 2 and still able to love Katara anyway?

In season 2 - ‘The Guru’ episode, the guru tells aang that if he leaves to save Katara before unblocking his final chakra (which forces him to leave his earthly attachments and let go of Katara), he will never be able to access the avatar state. 

However, when pressured in battle with zuko, azula, and the dai li, aang is able to unblock his chakra so easily. Doesn’t this contradict what the guru said? 

Furthermore, in season 3, we don’t see any ramifications of this. His relationship with Katara is no different and it doesn’t seem as if he let go of her at all. 

Is there some plot hole about this or somehow I just missed a crucial detail?
gpt
I don't think he had to stop loving her, but to unblock the chakra he had to stop obsessing/worrying about her. If something would have to happen to her, that would be sad, but he had to remain calm and not lost control, keep his balance.