The worst part is, there is a handsome , stable guy at my job who constantly tries to get my attention but I am committed to my fiancé so I keep having to dismiss him.

I'll probably get down-voted, but this part of your post rubs me the wrong way. Like you're looking for a reason to leave your fiance for the "greener grass"

Don't get me wrong, I was in an abusive relationship and

a handsome , stable guy at my job who constantly tries to get my attention

wouldn't have registered on my radar at all.

INFO: was he always like this, and if so why did you agree to marry him? You said you know he won't change. How did you support yourself and your children before you met him?