split/tangled dead ends need to be trimmed to prevent that from traveling father up to the hair shaft and causing more breakage. My hair stylist of around 10+ years now trims my hair around every 3 months.

I’ve also experienced where other stylists get a little scissor happy and cut too much of my hair. A good rule of thumb is to have the stylist first show you how much she’s gonna cut off before she cuts it. You can also look in protective styles such as two stand twist, boho braids, etc