Lot's of nice guys are confident too and we can learn to be wary at first, without withdrawing. You said yourself that you didn't fully trust the feeling. Your intuition was telling you what I've just said. It's not enough. I've met a few men who love to talk about life, spirituality etc.
Women find that very attractive in a man.
It's not enough to fall in love though. Someone said to me the other day 'you can't love someone until you know them'. I think this is very true. Know them, to me, means spending enough time with them to see all facets of their character, under stress as well as in 'ideal' dating circumstances. In their own territory, in your territory, with your family and theirs.