The Protector (Springbrook Hills #2) by Morgan Elizabeth (Romance fiction author)

"He was her first love. Luna Davidson has been in love with Tony since she was ten years old. As her older brother's best friend, he was always off-limits, but that doesn't mean she didn't try. But years after he turned her down, she's found herself needing his help, whether she wants it or not. She's his best friend's little sister. When he learns that Luna has had someone stalking her for months, he's furious that she didn't tell anyone. As a bodyguard at Garden State Security, it's his job to protect people. But can he use this as an excuse to find out what really happened all those years ago? Can Luna overcome her own insecurities to see what's right in front of her? Can Tony figure out who is stalking her before it goes too far?"