CLUE 1:the fist clue is ranma always blushes when she gets to close.And so does akane .
CLUE 2:The seconde clue is he saves her all the time(if he didn't love 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 of 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 kiss 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 u know he forgot when he was back to normal.
SO my point neither of them have to say i love you.Because u can see it in there actions and faces.