hey y'all! the key is creating a barrier of moisture between your hair strands and the harsh chlorine in pool water.
Naptural85 has an amazing video about this on youtube! check it out >> Swimming with Natural Hair | Protection from Chlorine and Salt - YouTube
you can slather your hair in conditioner and wear a swim cap.
you can slather your hair in conditioner, let it soak in a little and then swim with your hair loose (just so you don't dive in the pool and conditioner starts clouding up the place. awkward!)
you can also apply conditioner and twist your hair up or put it in a bun so your hair is somewhat protected.
but ultimately everybody's hair is different. Sometime the relaxed hair will start to "freak out" and break (remember: the line where natural new growth meets the relaxed hair the WEAKEST part of your hair strand). So...it might...be time... to cut a little bit off?
hope that helped! let me know how it goes