The hair dryer is almost definitely the cause. Heat damage accumulates, and using it on your hair every single day makes it accumulate that much faster. It's up to you whether you want to trim up the bottom all at once to even the hemline, microtrim regularly (take 1/4 or 1/2 inch off every month, for example), S&D out the worst of the damage regularly, or all of the above.
Hair dryers CAN be used safely, but you need one that has a temperature setting that you can blow on your hand without pain. If it's cool enough for your skin, it's safe to use on your hair. Or, you could just let your hair air dry. That's how most of us do it. It takes longer, but as long as you don't let your hair get caught on anything while it's down, it's much safer than all the manipulation it goes through for blowdrying.
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