Well, my thought process was that hearts seemed to be so important in our little section of the worlds, so why not play on that? Plus that sort of Hallmark stuff where they say "your friends are in your heart" and whatnot, and to kind of play on you being important to each other and always with each other since you were saying it's like friendship, but on a even higher level. Buuuttt, if you're worried about it, I can fix it.