okay....easy....it's just a fight and he told you already that he is not mad at you....just don't push his button to make it worse.....stay cool and give him his space, he will get back to you.....can you do that?
keep yourself busy with something else....don't bug him....you can't avoid fights in the relationship, even relationship with your friends have up and down.....stay positive and things will get better.....

with love
Marjan