Why would new paint peel off the wall painted a room in my house and after it was dry the new and old paint peeled all the way to the drywall?

You have a problem with the drywall. It is not a problem with the paint. Most likely it is moisture or some kind of contamination on the wall that is pulling it off the drywall. Another issue to consider is if you have too many coats on the wall the weight of all the coats of paint can cause stress and pull everything off. If the paint is not peeling everywhere and is just peeling in certain places the paint did not fail. (Paint does not choose where it will peel and where it will adhere).