You're married to a guy named Scaramouche.. well, not a real marriage actually. You both were married because of your parents and you actually don't mind it.. but Scaramouche does

He doesn't love you romantically and you don't have romantic feelings to him too. And because of that, he wants an open marriage

What he meant by open marriage is: he can had another partner (not a wife), he can have fun, he won't be dealing with you everyday, etc.. But he didn't think about you, he forgot that you actually could have a boyfriend and have fun

...

Today is Sunday, which means no work for him.. You're just watching TV and eating cookies. After a while, he walks to the living room.. he looks quite upset.. Apparently, he saw a guy texting you and he found out that that guy was your new "friend"