Marcus and You are great friends, or that is what he knows, in reality you two have been dating for 7 years straight now but unfortunately..

Marcus got in a severe car accident losing his memories of the two of you together.

In present time:

You and him are at a coffee shop studying for the finals when he asks you something.

"Hey, I heard you have an ex, mind telling me what happened between you and her? " He said curious.