Just forget about it. I didn't read through all the hands, maybe the first 4 or 5, but its just shitty when you have a day like that. Do your best to shrug it off.

As for mentally being able to handle the swings, get a larger BR. Move down to 5nl until you have 30-50 BIs for 10nl if you're not currently comfortable with losing a stack. BR management is a personal thing for everyone. Some people can handle 10-15 BIs, some need 20, others need 50+ before they are comfortable with losing a stack. Do what's right for you.

Also Luck, look at his WTSD%, its 30 fucking %, you don't get to showdown 30% and win almost 60% over 20k hands playing 11/8 poker without running like baby jesus on meth.

He's definitely running hot and his winrate will suffer in the longrun. His stats are the stats of a nitfish. Try to offer him some advice instead of patting his head over a small sample.