Well I played through it and there was no kiss scene in it. Near the end of the story what is your score with Gil? (by opening the menu and then clicking characters then on Gil). Mine is 6 hearts and 74 thumbs up. If it is different that might be it. In which case I wonder what choice I picked wrong... Do you remember what you chose?
Mine is 13 hearts and 91 like/ There is a guide up to day 7 https://docs.google.com/spreadsheets/u/0/d/1opecc1Wkh4iUxIYTlF0c5NtbbmmQ_30fIH2b5JXbqUQ/htmlview# just click on gilbert and there u have it /not my guide tho