By Peter Sblendorio Forget summer loving — breakup season is hotter than ever. The highly anticipated time of year reserved for care-free vacations and fun in the sun has turned into a last resort for some A-list couples like Taylor Swift and Calvin Harris and Demi Lovato and Wilmer Valderrama, who recently checked into Splitsville. And there's a good reason why so many relationships are cooling off right as the weather heats up. "There's an old-school thinking that summertime is play time," relationship expert Susan [...]