"He was a lot of things to me" "The only conclusion was love"
I think Henry was a bit like Regina is this regard: he wants it all. He wants his mother Emma, his father Bae, his perfect grandparents, his adoptive mother Regina and more importantly he wants peace and harmony to exist between all these things. To his understanding the only thing standing in the way of getting it all, was magic. Destroy magic and he could have the life he wants, with his whole family, together, in one place.
In regards to GoldenKey’s theory: Well he is his fathers son so I can see him becoming Pan, but the question is: how did he get to Neverland? Did he go by himself? Did someone send him there (I know the leading contender for this is Rumple but I can’t bring myself to believe that)