There are many reasons why Taylor Swift's engagement to Travis Kelce has brought wild, uncontrollable, Instagram-saturating joy to the world. But, the big one? The fact that, for years, she's been writing incredible songs about all the relationships that didn't work out; songs that every woman can relate to, hard. Now, if she's finally happy, that must mean that we all can be too. In a world of heartache, pain and reality TV faux-mances, Swift and Kelce's love story is one we're all invested in.