How to clean up some of the script in a two input file while loop?

This is my script.

while read lineA; do
  while read lineB; do
    if [[ ${lineA##*/} == ${lineB##*/} ]]; then
      printf "${lineA##*/} and ${lineB##*/} match\n"
    else
      printf "${lineA##*/} and ${lineB##*/} don't match\n"
      printf "$lineA\n" >> file2 # Add Line if Not in file2
    fi
  done < file2
done < file

The script endless runs and in file2 adds endless lines.

It is reading right. I was trying to get line 1 in file to read through each line in file2 adding only new lines to file2 if not in file2. Repeating line 2 in file through each line in file2 adding only new lines to file2. Reading all lines in file till done. What can I do to correct this?

Hoping for: Script

Hoping for: Script

Checking 'Bull.txt' in file2

Fox.txt don't match

Zebra.txt don't match

Adding Bull.txt to file2

Checking 'Cat.txt' in file2

Fox.txt don't match

Zebra.txt don't match

Cat.txt is a match

Not Adding Cat.txt to file2

And Than: checking file2

Fox.Fox.txt

Zebra.Zebra.txt

Bull.Bull.txt

Cat.Cat.txt

only