It's a Funny Story Actually

An average day out to eat with his family turns into a reunion between two long lost friends.  Rudely, Andrew is at the next table making a lot of ruckus.  He's talking loud.  So, he's approached by Mark.  “Hey, buddy, we're trying to eat over here-”  But, come to find out, its his old buddy from high school.  Andrew is going through a break up with his girlfriend of two years, and he's going crazy.  So, Mark decides to help him get her back.  But, unexpectedly, Mark happens to meet a woman, and they become close.  It's Andrews ex girlfriend.  But, he doesn't know because he has never seen her.  What will happen?