sqad - I love you too, but sometimes you are an @rse.
Joanne is hurting - be a little more sympathetic eh? She loves the guy and doesn't want to give up on their marriage just yet - and so she shouldn't.
I don't see why it is assumed there is another woman involved, I just think her husband expects to still have the 'in love' feelings and just because they've gone, he's questioning their marriage.
I agree with you that this is quite normal, but actually telling your spouse you aren't in love with them anymore, even though they do still love them, can be very hurtful.