Getting over someone is a grieving process. You mourn the loss of the relationship and that's only expedited by 'Out of sight out of mind.' But when you walk outside and see them on a billboard or on TV or on the cover of a magazine it reopens the wound. It's a high-class problem but it's real.
I was a huge fan of comedy and movies and TV growing up and I was able to memorize and mimic a lot of things not realizing that that meant I probably wanted to be an actor. I just really really amused myself and my friends with memorizing entire George Carlin or Steve Martin albums.