If you want your hair to grow healthily and you have split ends then your only option is to cut it. Split ends keep splitting up the hair strands when your hair is still growing and if you don’t regularly trim your hair when you have dead ends you’ll have to cut off a whole lot more than you would ever want. So you HAVE to cut it if you want long healthy hair. You can keep your hair healthier with less thermal styling and deep conditioning + keratin hair treatments.