That's one of the mistakes that we as women have. WE expect the other person to change. Did you ask him about what he thought of marriage since once day you might want to get married and knowing that he was married twice? take ownership that you got involved with him without asking him first, now, you cannot say but I want to be married. Love him and respect him and if his choice is not to marry ask him why, and if it is a good reason, then respect his decision. Also, ask yourself if what you want is him or marriage and what do you look in marriage, is it the image of portraying yourself in a different way, is it the security that marriage brings? after asking yourself these questions then you can find out if you are also ready for another marriage.
Cheers