I have some hair issues! help!?

ok. i have super thick, super dark, super curly hair. awesome. but my problem is those darn split ends and breakage!! i dont understand how hair so thick&strong can have so many split ends! some of my split ends have split ends!!! no lie. so what can i do to cure my hair issues? i stopped straightening it altogether. havent blow dried it or straightened it in 3 months. it should have helped but it didnt. and the frizziness is unstoppable. what do i do?!?!?