Sorry to hear that
And I refuse to believe that CBL is your terminal/predestined length. So let's brainstorm!!
How much manipulation do you have in your regi?
Do you sleep on your left side?
Do you have regular protein in your regi?
Do you wrap your hair? If you do, do you alternate directions?
Are you left handed? Do you subconsciously mess with that side of your head more?
Since you're able to grow to CBL without the breakage, maybe once you start getting close to or hit CBL, you could change up your regi to help you get over the CBL hump? In the past decade I've been on the hairboards, that seems to be a common remedy. Sometimes the change is small, sometimes it's a total revamp (such as rinsing/washing your hair more/less often, etc).