SPLIT ENDS?!

so I straighten my hair 3 days a week, because I have really puffy frizzy hair and I don't like it, so I like to straighten it. my hair was completely fine and healthy until like a month or two ago... I started getting split ends and I feel as if my hair is dying. anyways to help my hair out? *other than stop straightening my hair cus I know I won't do that lol*