It's wrong to let little things get between a relationship.
Victor is telling Jane that he wants the walls of their home painted yellow and Jane is absolutely refusing that color.
Victor wants to express his disappointment to Jane.
Victor tells Jane that he just wishes he could have  a yellow room and that it sucks she doesn't like it.
Victor tells Jane that she's just too inflexible and hardheaded about the color and that he's done with her entirely.
Jane is sad to Victor pouting, but she tells him he'll be fine when he picks a different color.
Jane is flabbergasted that Victor just escalated a discussion about paint into the end of their relationship.