Which one is correct?

[ozlembal]

I was looking forward to eating at the new restaurant or I was looking forward to eat at the new restaurant?

Why first one is correct? Can anyone explain the grammar behind it?

[Josef Essberger]

I was looking forward to eating at the new restaurant.

"look forward to" ends with a preposition

prepositions are followed by nouns

verb-ing is the noun form

https://www.englishclub.com/grammar/pre ... s-rule.htm

[ozlembal]

Thanks for your answer