A manga about a girl who works in a flower shop, lover has private beach house and gives her his earring
Could it be Kiss/Hug?

The girls works in a flower shop that belongs to the family. The scene you're describing resembles one of the last few chapters where he has to go to England for some work he does.

Synopsis


  Ryuu, a super-business-like transfer student from England with black hair and blue eyes just arrived! During the night of the Tanabata festival, Ryuu and Yukino became attracted to each other at first sight. He then declares, "You will be mine!" This brought confusion to Yukino, who has zero experience in love. But could she actually be falling in love?