if my husband is a non arab revert who cant pronounce letters in al fatiha properly, I CAN pronounce all letters correctly. can he lead me in salah. i feel very shy and guilty to tell him he cant. i fear undermining him and hurting his feelings. plus we'd be newly-wed as well

Learn this as a rule, if his salah is correct for himself then it is correct for those praying behind him. However do correct him gently if the mistakes he does will change the meaning of the Fatihah and you will get rewarded for it in sha'a Allah. But the way you approach this should be very beautiful, not in a repulsive manner.