Love Undecided by Denise Wells

Together or apart, either way she breaks his heart.
As far as Kat’s concerned, if you have too much goodness in your life it will always turn bad. Except for Brad. Because nothing bad ever happened to Brad until Kat. She’s Brad’s bad. Even if her reckless behavior doesn’t hurt him, the timeline on her life will. It’s why they’re apart. And if she has anything to do with it, they’ll stay that way.
For Brad, life with Kat is hi-definition Technicolor on a crazy beautiful display. Everything else before and after her is just grayscale. Which is why he’s going after her and letting nothing get in his way.
As soon as they catch the guy who is stalking her. And he finds a way to break it off with his current girlfriend.