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Reply to "be proud to be ing"

Both are correct. Grammatically, in:

- I'm happy helping you.

"helping you" is an adverbial that indicates the time or manner in which "I" feels happiness. Notice you can place it in front position:

- Helping you, I'm happy.


- I'm happy to be helping you.

"to be helping you" complementizes "happy" and seems to me to express the reason for "I"'s happiness.

Hi, Gustavo, thanks a million.