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, it's his old buddy from high school. Andrew is going through a breakup 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's ex-girlfriend. But, he doesn't know because he has never seen her. What will happen?