so confused

Caroline
Hey ladies I have a Q about what you would do in this situation: wife cheats on husband and tells him about it months later. Of course hubby is broken hearted understandably but is willing to let wife try to fix and make it work. 6 months later he says he wants to talk and says he doesn't want to stay together if wife is not going to commit to being fit. Wife loves hubby unconditionally but thinks this isn't fair because he is not willing to reciprocate that love unless she loses 80+ lbs. What advice would you give? This is what she looks like right now and they have a kid together.