I’ve Walked Where You’ve Been by Marina Vivancos

Matty knew he would bond with his soulmate one day—everybody did—but it was supposed to happen when he was older…not when he was just nine years old.
Now, he’s stuck with some kid named Ethan, who doesn’t even like to play outside. They can’t stay apart for long, and Matty’s resentment grows as he has to follow Ethan to boarding school first, then college.
As the animosity between them grows, their bond weakens. The universe proclaimed them soulmates, but if they want to reach the potential of that love, they’re going to have to learn to understand each other…or lose their bond forever.