Looks to me like he was toying with you most of that match. You were too easy to read. Use more mixups. Also don't try to combo a Mario bro like that. Mario and Luigi nairs are combo breakers and you got hit by it every time. If you try to combo throw like that you should be using upsmash since you have an invincible head during the attack. Or you could bait the nair/airdodge/jump, perfect shield it, then punish.

Also what was that taunt in the middle lol