How do I get a woman to break up with her boyfriend for me?

I want to date a woman that is seeing another man. Their relationship is very iffy sometimes and I want to be the man in her life because I am so much better than him. Not only this but we are so much alike that her boyfriend cannot even come close to the kind of bond we share. How do I get her to realize this and make a new commitment with me instead of her insensitive buffoon for a boyfriend?

It is worth noting that she is interested and has thought about a relationship with me several times. Info from her best friend’s mouth.