Think making the new account was right, I'm not sure how "net guy" would explain his 
ANOTHER stood up, probably like nothing happened, but for Satou naive insecurity it would be a terrible thing to continue, it's exhausting. 
Sure it looks like Yamaguchi is a 
tad manipulative asking Satou to make a new account and ditching the "net guy", but seeing her depressed again continuing her "relationship" would be heartless think to do. 
I like how little dense Satou was to Yamaguchi when he asked her on the date, further prove without his honest intentions she would be very venerable if someone else would try to really take advantage of her.
Yamaguchi being asked by classmates if they're dating, he knows Satou doesn't share the same feeling yet, he is being considerate and only saying he likes her, so no bad rumours spread. 
Yamaguchi is a skirt fetishist, I see he is a gentleman  
 
Thanks for the scanlation!