(London Sun/Gawker)

Breaking up with someone on Valentine's Day is pretty rough . . . breaking up with someone on Valentine's Day like this is STONE COLD.

Yesterday, in Manchester, England, a woman named Laura bought some ad space on a small billboard at the deli where her boyfriend Dan buys his lunch.

And the ad says, quote, "Dan, I'm leaving you for Gary.  Your clothes are at your mom's and I've changed the locks.  Sorry to do this on Valentine's Day.  Laura."

We don't really have any more info about Laura, Dan, or Gary the homewrecker . . . all we know is a BUNCH of people spotted the ad, and took photos of it.  But I think we can assume Dan is NOT happy about it. 

(London Sun / Gawker)