My favourite is "You are awesome, babe!" or "you did awesomely!" at the the end of a long day bargain hunting.
Simply tell your bf that women like to be reminded that they are appreciated so they don't feel taken for granted. Reminding your partner how much they mean to you or how lucky you are to have them (I often say to my husband "What did I do to deserve you? Because what ever it was I'd do it 100 times over again!") is one of the things that helps keeps the spark alive.
'People are never perfect but love can be. People waste time looking for the perfect lover rather than creating the perfect love' - Princess Leigh-Cheri from Still Life With Woodpecker.