I hardly touch my hair(straighten,curl ect) yet it is very weak and i keep getting split ends?

My hair is about 4 inches below my shoulders so is classed as long, i'm 16. And I used to dye my hair alot but havent in about 4 months. I get it trimmed once a month. I wash my hair every 2 days as it gets greasy, and I play sports. What can I do to restore it? I don't want it all cut as i'm trying to... show more My hair is about 4 inches below my shoulders so is classed as long, i'm 16. And I used to dye my hair alot but havent in about 4 months. I get it trimmed once a month. I wash my hair every 2 days as it gets greasy, and I play sports. What can I do to restore it? I don't want it all cut as i'm trying to grow it longer. Thanks!
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