Manga about a girl A who asks girl B out. Girl B says to girl I'll go out with you but if I'm ever unhappy I'll break up with you. Fast forward many years later girl A is being cold with girl B but it turns out to be an act
Still looking for this
I wish I knew. If you had any more details, that might help.
They're in high school in the first part. And adults in the next it's a pretty short story definitely not more than 12 pages. Girl B came home from work and girl A acted cold the whole night while Girl B was pining and when they went to bed girl A revealed she was just teasing girl B saying something like "you really love me don't you"
I'm sure i've read this before but i forgot the name...