Act of True Love
.....proves beyond doubt that you are ready to put your loved one's interests before your own, that you are truly loyal and devoted to them. Usually this involves a sacrifice on your part, at the very least a considerable effort and/or a great risk. The action must be motivated, not by morals or principle or expectation of future reward, but by sheer personal affection.

Dance of Romance
So Alice and Bob, who either don't know each other very well, or are Just Friends, are attending some fancy party. For some reason, they wind up dancing to some slow romantic song that requires waltzing or some other dance typified by close body contact. Hey, that's okay, nothing special — except she's starting to blush, and he's getting all nervous. Could it be? Are they in love?

High School Sweethearts
This is when a couple has started dating in high school.

all

Well, so long as I like the couple, haha

Or act of true love. But DE & Dances are connected. That epic dance in 1x19 says it all.

I guess