How to fix my damaged hair extensions

About a week ago, I bought Human Hair Extensions. I didn't want clips, so I got them glued into my hair. They looked amazing the first day, but as soon as I had a shower with them, they looked kind of frizzy. I blow dryd them then I straightened them...

and they looked better agian, but I've had showers since, and I blow dry them and straighten them everytime, and now they are very damaged looking. Is this because I am blow dyring them, or what? How can I make them look less damaged?

IM A EXTENSION QUEEN! NUMBER 1 RULE THE LESS HEAT THE LONGER THEY LAST. YOU SEE EVEN THOUGH IT SAYS HUMAN HAIR ITS STILL MIX WITH OTHER FIBERS SO YOU CANT REALLY REALLY TREAT IT AS IF IT WAS REALLY YOUR OWN HAIR. HONESTLY YOUR REALLY NOT EVEN SUPPOSE TO WET IT CAUSE THIS CAN DAMAGE THE TEXTURE OF THE HAIR. THE MORE YOU WET IT AND THEN BLOW DRY AND THEN STRAIGTEN IT THE MORE UNMANAGABLE IT WILL BE. YOU'LL NOTICE IT WONT MOVE THE SAME OR BE AS BOUNCY AND FLOWY AS IT WAS WHEN YOU FIRST PUT IT IN. AND IT'LL TANGLE UP a lot

im having the same problem they was amazing until I washed them now they get knoty and are very frizzy HELP. I've STOPED DRYING THEM NOW AND I RECOMEND THAT YOU PUT THM IN TO PLATS AFTER UV WASHED THEM THEN when THER DRY TAKE THE PLATS OUT AND PUT SOME SMOTHING BALM ON THEM THIS WILL GIVE A NICE WAVED EFECT AND STOP THEM FROM DRYING OUT XX