1x14 "The One with the Candy Hearts"

Ross' first date in nine years is on Valentine's Day with a beautiful neighbor. Carol and Susan, also out on a romantic date, end up at the same restaurant where Ross ends up kissing Carol. Joey sets Chandler up on a blind date-with Janice and they end up sleeping together. Chandler ends up breaking up with Janice on Valentine's Day. And Phoebe, Monica and Rachel decide to spend the holiday burning mementos of their past boyfriends which causes a fire.