Hmm, it seems your hair is quite layeres... if those were grown without trims I would say that your upper layer might be the one getting most of the splits. In my case, this happens too.
Anyways, I would suggest keeping up with the S&D'ing, altough if you're really unhappy you can figure if most of the splits are in your hemline, as if they are you can simply have a small trim.
I know this is easier said than done, but good luck Your hair is very pretty by the way!
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