From what I understand, split ends 'travel' when hair gets wet. When hair gets wet, it takes up water which makes it expand, this stretches the cuticle of the hair further, which makes the split larger. The best thing you can do to protect again that is soak your hair in coconut oil before it gets wet. Because it penetrates the hair it has a sort of waterproofing effect.
Coconut oil is also supposed to be good for bleached hair too I think? (for a number of reasons that I can't remember sorry, I don't have bleached hair so they doesn't stick in my mind).
I couldn't guess if you needed to trim or not. You hair looks nice in the pictures but I guess it depends how you feel about it and whether you feel like babying them is worth the effort. I'm a big fan of S&D but other people find it very tedious.
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