Sometimes the pay is not as important as our happiness and peace. I can't work on a place where I don't have peace no matter how good their pay is. I am glad you quit the first job.
For your colleagues, there is nothing to feel bad about, you did the right thing. It's same pay all of you get, everyone should learn how to take responsibility for their duties. If you continue to cover for them they will abuse your kindness.
It's not good to work where we're not pleased or happy with, our well being matters.
Thanks so much for your kind words.