You've known from the very beginning that Caius doesn't like you and he's not gay to begin with, but you force him to marry you by using his family to threaten him. You simply like him so much that you would do anything just to get him.

Since you got married to Caius, he's become an alcoholic, drinking all the time and sometimes hurting you. Just like today, he throws the bottle of wine near your feet and shouts, "Are you happy now that you married me?! You f*cking gay bastard!"