Well, first of all, it seems like you were being really selfish marrying this man when you still had feelings for someone else. That's not being honest with yourself or your husband.
Now, if you are unhappy in the relationship you are in, then you need to do whatever you have to do to make yourself happy. If that means divorcing your husband and pursuing a relationship with another man, then so be it. Your husband deserves to have an honest woman that loves him and if you can't provide that then you need to move on and let him find someone that can give that to him.
Do some soul searching and figure out what's going to be best for the relationship and for yourself. I wish you all the best! :-)