CLUE 1:the fist clue is ranma always blushes when she gets to close.And so does akane .
CLUE 2:The secondo clue is he saves her all the time(if he didn't Amore her he wouldn't save her).
ClUE 3:RANMA ALWAYS GETS JELOUS WHEN A GUY LIKE RYOGA IS NEAR AKANE!!!!and AKANE ALWAYS GETS JELOUS WHEN SHAMPOO o UKY IS NEAR RANMA!
CLUE 3:In the ova ep 8&9 ranma was jelous and mad at the guy akane was with in the forest.
CLUE 4:IN OVA ep 13. akane only let ranma try to baciare her when she was asleep!!
AND LASTLY CLUE 5:When ranma was in his wierd cat mode he attacked everyone but akane.Not only that but kissed her!!!(but te know he forgot when he was back to normal.
SO my point neither of them have to say i Amore you.Because te can see it in there actions and faces.