It is possible that he is teething again, but not showing any signs of teeth kwim? Quite often my little boy would be totally off his food for up to three weeks before the tooth appeared, and only in hindsight would we realise that is why he was off it. It is also possible that he is just getting thirsty during the night and needs a drink to quench his thirst before being able to go back to sleep. I don't think you rushed him, it is probably more likely that once you got that situation sorted, he has moved on to the next developmental stage too.

For the time being, would you be happy to give him some boobie at night again just so that he settles and see how that goes for a bit? He might only want to have it for a little while and then settle back down again for you.