Cat all files in a folder including filename by using a for loop?

With this for loop which I execute directly in the shell, I am able to cat the contents of all files in a folder, with the value beside of it:

$ for f in *; do echo -e "\t"$f"\n"; cat $f; done

Example output:

100 
    testfile1
    testfile3      <-No output because this file is empty
hello 
    testfile2

But I'd like to print the value on the right side and the file on the top left like this:

testfile1 
    100
testfile3
testfile2
    hello

I tried to swap the position of echo and cat but that doesn't work, it works exactly as the other command.

$ for f in *; cat $f; do echo -e "\t"$f"\n"; done

How can I achieve this?