It's kind of obvious she was talking about Gippal. I mean, she said something like... "I have this special connection with someone" or something like that. I don't remember. She also said she's not telling who, and Paine was like "I bet I know who." (or something like that.) Throughout the game, it's kind of noticable that Rikku really cares for Gippal. Haha. ^^