Your wife’s explanation just does not make any sense to me. I cannot believe that for two years while you two waited to become engaged that she felt this overwhelming obligation to marry you, knowing full well that she did not “fancy” you. That is simply preposterous.
She may not want to be married to you now, and you may best leave the marriage, but her reasoning does not ring true. Either she really did “fancy” you at one point, prompting her to stay with you until the engagement or she is giving you a line to cover up something within her that she doesn’t want to admit.
Have you tow been to counseling? I don’t know your sitch, so by the admiration others have given on this board, I assume you must have. But I wonder if she doesn’t have some other major problems that account for her lack of emotion. If you don’t care to go into this, I understand, but it sure sounds like she has some major issues to deal with. It also sounds like you do to, since you stuck with a woman that you knew was emotionally distant. Did you not choose her yourself knowing that your wouldn’t have to worry about being too committed and smothered?
I don’t want to sound calloused. I know you are having a tough time. But has this line to thinking been addressed?