I kno this sounds silly,but i am senior of almost 70,i am not married or dating,people?

ask me how come im not married,well i say i dont wish o make the same mistakes my brother made,his first marrage was at the age of 22,7 years and two kids later he divorced,then came wifey#2 and three kids later at 8 yrs he got tired of her and now hes bored with his present wife and has a daughter who 4 yrs old by her.do you get the drift of my story?what should i tell these inquisitive folks?