Always use the pronoun me as the object of a preposition.
Here are three more prepositions that can be followed by the pronoun me: about, after, before
Grandpa told a story about me.
Susan went before me.
Jim chased after me.
If we add a second object of the preposition, we still use the object pronoun me.
Grandpa told a story about Bill and me.
Susan went before her mom and me.
Jim chased after Bobby and me.
We also use the object pronoun me with the preposition between.
John sat between Mom and me.
Don’t let a little disagreement come between you and me.
The pronoun me is an object pronoun. Use me as the object of a preposition in a prepositional phrase.