Love in Bloom by Lisa Swinton

Camille is supposed to keep her stress level down. A fake marriage is definitely against the doctor’s orders.
Following a collapse at Lakr, her makeup company, workaholic Camille is sent to the French Riviera to reshape her health habits. The beach is beautiful, but boring, until Camille reunites with university chum Tristan. He does things to her heart her doctor wouldn’t approve of.
When he offers her the chance to attend the exclusive French Royal Château and Garden Tour, Camille jumps at this once-in-a-lifetime opportunity. However they’ll have to enter into a fake marriage to go on the tour.
On holiday from his research lab in India, Tristan is delighted to be reunited with Camille, his university crush. With each passing day, his feelings for her grow. Self doubt convinces him that he’s unworthy of her love. Tristan must protect her from the secrets of his past, even if it means breaking both of their hearts.