Fleeeng or Fleeing: How To spell?

The word Fleeeng is misspelled against Fleeing, which is present continuous of "Flee"

Word contains consecutive vowels 'EI' in between alphabets fle & ng is misspelled as 'EE'
Wrong Spelling:  fle-ee-ng 
Correct Spelling:  fle-ei-ng 
Explore spell check of Fleeing to spell without errors.