Yeah
..that scene was perfect. There was so much hidden emotion and even though Hotch isn't known to wear his heart on his sleeve, JJ is slowly bringing out his vulnerable side.
I think we'd all agree #15 and #19 are equally important but because I've never seen Hotch smile so much in one scene and they were mostly all directed at JJ (in the last epi), her words in #15 have even more meaning now.
I may be a bit ahead of myself but a new title suggestion could be:
"because one day he'll remember and it won't hurt..and she'll make him happy"
or just...
"because one day she'll make him happy"