Driving me Crazy

So I read this book in like 1996 or 97 I think it was a harlequin blaze. Main male character was named something with a g. Girl was like twenty years younger then him and had been the flower girl at his first wedding. He was divorced and came home to run his family department store. They started sleeping together and then he broke up with her but then her aunt tells him she’s pregnant so they get married but she tells him she’s not pregnant but she is pregnant so she seduces him into having sex with no protection using chocolate frosting. Has a weird sort of sub plot about how his ex wife still loves him