I think he had a thing already with the old friend/ mutual classmate back in college, or atthe very least a crush on her. To me is seems like the husband always tries to push down his wife quality so he can control her (mentally,emotionally, and sometimes verbally abusive). The things he try to control her to do, is something he wants to do to the "old friend" chick, so he projecting onto his wife. I also think he proposes to her so abruptly because the "old friend" was getting married. Even though their relationship was iffy, because he was leading her on, he still decided to propose because he was projecting.
so for sure, the husband is cheating not with the student but an old friend/mutual class mate.
the wife is officially cheating with the brazilian guy who is i think divorced? or in the process of getting a divorce and he has a kid.
wtf is up with the husband does he hate kids or his sperm doesnt work thats why he doesnt want to give his wife a kid?? or did he grow to resent her? bc i feel like the flashbacks he was sooo suspicious T_T i feel like he only wanted to marry her bc he doesnt want her with anyone else? bc anytime he showed “affection” or had sex with her he was also indifferent and emotionless