The Heart of You by Jennifer Hartley

Weddings always have a curious effect on their guests and when Jude’s friend Eric gets hitched, he starts to see his friend and long time ballroom dance partner Hailey in a brand new light.
But with Hailey busy with law school, travelling the world, and her charity projects, and Jude entangled in a tepid relationship with his girlfriend Cynthia whose jealousy starts to get out of hand, it seems that they are destined to be apart.
When Justin breaks up with Cynthia and moves in with Hailey in the aftermath, their budding romance starts to gain momentum, and the two finally come to realize that they’re destined for each other, never to part.