Re: you did it for other men, but not me?
Yes I suppose it is the same thing. Just because a woman enjoyed giving a guy a blow job in the past does not mean that she will enjoy it in the future or that she should feel obligated to give one.
I am not saying that I could not relate to someone being disappointed because their wife does not want to give him a blow job I am just saying that that is her right to be comfortable with what she does and is giving or not.
I would say that if she does not meet your needs than leave, otherwise get over it.