Messy breakup

I want to break up w/ my fiancé of 5+ years, we live together and have 2 kids together. He has no close family in our town and uses that as an excuse every time I say we need a break, but now I’ve had enough of him making the same old mistakes over & over again and I want to breakup, he won’t budge because he thinks I don’t mean it and believes we should stay together but there’s only so much a woman can take of bullsh#t and his promises to change are nothing more then dribble 😂 so HOW do I go about breaking up with someone who doesn’t want to hear it! He knows I’m very serious this time which is why he keeps trying to change my mind. Ive been feeling this way for several months and now I’m ready to move on!