Who doesn't love correcting someone when they say, "Harry and me grabbed a tuna melt at the deli"?
It's "Harry and I," groans the crowd.
But this common mistake sometimes makes us hypercorrect from me to I, even when it's not necessary. Don't fall for it.
One of the more common examples is when people say something should stay "just between you and I." It should be "between you and me," but our brains see "and me" and run screaming in the other direction.
Pro tip: just change it to us. It'll save you some hassle.
Example
The break up wasn't easy for him and I.
OR
The break up wasn't easy for him and me.
Door number two is the winner. Think about it: does "the break up wasn't easy for I" sound right? Not so much. Make sure each pronoun fits in the sentence on its own ("the break up wasn't easy for me") and you're good to go.