Re: so you dont love your wife anymore
people grow, differences develop and in most cases are mutually sorted out and accommodated, there is something called irreconcilable differences where people fail to accommodate each other's needs/wants/preferences.
The person leaving is not always the one who is at fault and its not immaturity driving it. In my view its actually more mature to realize if something is not working out and does not have a likelihood of working out and making a tough decision of parting ways.
Its amusing but if the example given was of some lady who left because her husband was not able to change himself the assumptiosn would be that he was an ogre, a monster a controlling freak and an abusive neandrathal and that she is better off without him, grrrrl power and all that jazz.
:)