The Night of the Wedding (Harlequin comics)

Kate happens to walk in on her boyfriend, Steven, who she was thinking about marrying, in bed with another woman. Brokenhearted, she runs to her childhood friend Nick, who she has known for twenty years. He is now a playboy running an IT company; but he understands her feelings the most because they grew up together. A month after he's comforted her just like in the old days, Kate realizes that she can’t avoid running into Steven at her best friend’s wedding, so Nick offers to act as her boyfriend at the event!