Are you asking for a critique? The only thing I saw that I might comment on was when you had him on the line lunging and asked for changes of directions, yo9u were very abrupt and might have given him a bit more preparedness by slowing your body, lifting the rein to encourage him to flex and lean back onto his haunches a bit before you ask for him to come around and change directions. It just looked like you rushed him and took him by surprise. He looks like a very trusting horse, too.
Same thing when you took up the rein to flex him; the speed you run your hand down the rein should be about equal to the speed you take up the slack in the rein. Give you horse a chance to feel the uptake and he might react to it before you even have any real pull on his mouth. Slow, smooth and steady.
You seem to have a good relationship with him and ride him well.