The Way Back to You by Linda Lael Miller

Tony Morelli had always pursued the things he wanted with single-minded tenacity and authority. It had been a very successful strategy in business, and it had been almost as successful with Sharon Harrison. From the moment they met, he and Sharon had explosive chemistry. Tony had been sure they would follow their heart-stopping passion into happily-ever-after.
Until everything fell apart — Sharon wanted more, and Tony was no longer sure of their future. But he did know he wasn’t ready to let Sharon go. Now separated, Tony still feels a connection with his former lover and he’s sure she feels it, too. If he could win her over once, he will do whatever it takes to get her back again. This time, Tony will wage a passionate war to keep Sharon for good!