B2 to mix up someone's mind or ideas, or to make something difficult to understand使困惑，使糊涂；使混乱
B2 to mix up two separate things or people in your mind, imagining that they are one将…混同，将…混淆
I think you're confusing him with someone else.
If you give them too much detail, you'll just confuse them.
We were confused by the fact that the signs pointed in opposite directions.
Stop confusing me with all those figures!
The instructions are designed to confuse people.