Awesome post...and all those dialogs are my favorite as well!
No its not needed and there are more of such meaningful soulful dialogs between them which speak much more than I love you.
Small gestures even speak volumes like him helping her wear the earring. her grabbing his hand while his ex wife was getting engaged.
There are many many more of such instances
Its just that the same continuity cease to exist in their relationship at times making us wonder if they really meant what they said.
But yeah, off late, such dialogs are becoming more frequent and a little consistency is setting in.