the truths
*these are my own personal opinions, and may not reflect every Ranma/Akane fan out there. This is just what I've gleaned from reading the manga, and 15+ years of being a Ranma fan.
They're supportive of one another
They're comfortable, on a physical & emotional level
Both get irrationally jealous of other people
They're attracted to each other
Both go to extreme lengths to protect the other
They take the engagement seriously
They're deeply in love, even if they can't admit it