I need help..

Hi girls, i am currently going through a break up and i dont know how to do it, i know in my heart it isnt going to work and that i need to leave before this becomes something ugly, i know im wasting my time, its more than the third strike and i should know better.

I have been with him for 1 year and a half.

To me is acts like a kid in maturity wise and he goes off in the most stupid moments.

I'm tired, he keep promising me he'll work with me but obviously he never does. :(

I need some help, I don't know how to do this..