How to end an relatioship with a girl in matured way!!!!!

When u knw u are tired of a girl due to her attitude.. Her behaviour,,none respective...Etc.. Jurt call, her nd go straight to d point no need of afried.. Nd wen u tall..Try to ask her dat..Dis brake up does nt mean we should quit talking to each other...We can still be frnds.. That all.. Nd try to have an hand shake with her