Why is my hair like this?

When i get out of the shower, i never blow dry my hair, i let it dry naturally. When towel drying i pat it dry gently. I very rarely use hairspray or products of that sort. I tie my hair before i go to bed to prevent breakage while i sleep, and i tie it loose enough so the hair tie doesn't break my hair (no metal on the hairtie). i use conditioner, but i always make sure i dont keep it on more than it says on the bottle.I use moisturizing shampoo/conditioner for my hair type. (normal hair) and it's the brand called Redken. I drink lots of water everyday to keep my hair hydrated. I only brush when i need to in the morning and before i go to bed, i make sure i dont overbrush, and when i do brush i do it as gently as i can. yet i still have split ends and breakage. what am i doing wrong?