Why does my hair fall out every time I comb it or run my fingers through it?

I cut my hair in Jan. 2011 and went "Natural". I wash my hair 1-2 times a week. I usually style my hair twice a week. I only use Suave Professional shampoo and conditioner with almond and shea butter. I use Cantu's shea butter leave in conditioner and extra virgin olive oil (to seal in the moisture) to style my hair. I never use heat. My hair air dries and I use a detangling comb to comb my hair and only when its moist/wet. So my routine is simple and I don't understand why I have so many "hairs" all over my hands and in my comb