Congratulations on getting little Flint! Regurgitating is indeed a sign of affection. It sounds like you are making great progress with him. However, if he regurgitates too much, he can become undernourished. A little of this behavior is not something to worry about, but you don't want him doing this too much or obsessing about one object or person. Keep an eye on it, but I don't think you need to be worried.