2015: The Summer of Splits

From Gigi Hadid and Cody Simpson in May to Jon Hamm and Jennifer Westfeldt in September, here at the 16 couples who called it quits during the summer of 2015. Here's hoping the fall will be a lot less heartbreaking

SIENNA MILLER AND TOM STURRIDGE

Two weeks after vacationing in Ibiza with their 3-year-old daughter Marlowe, Miller and Sturridge announced in July that they were separating. "Tom wanted to get married and have more children. Sienna didn't," a source told PEOPLE about their split. That's not to say we've seen the last of this pretty pair. "They are over, but don't rule out a reunion," says the source.