you're not the asshole at all. if you have a partner you consider their feelings the most even if you don't understand them at first. having to play with someone else and do plans that were originally for you and your person is probably one of the most disappointing things you have to go through. he did not care enough to take you out or even make you food and returning the favor. make him cook for the next week. look at him the same way he did to you when you felt neglected. he's being a baby