Dave has recently taken jennifer out for a wonderful, elaborate birthday date, which involved all of jennifer's favorite activities and an expensive gift. however, when dave's birthday came a week later, jennifer gave him some flowers and told him that she had too much work to do, so they could not go out anywhere. remembering the birthday he had given jennifer a week earlier, dave was very upset. jennifer could not understand his anger and told him that she had thought that the gift the had given her was because he loved her, not because he thought he would get a gift later. dave considers the relationship to be based on and jennifer considers the relationship to be