You can do better. It started one night when we realized that we were both pining over the respective guys that we were seeing (or maybe more accurately, trying to see) and evaluating our own behavior towards them, asking what we could have, should have, would have done differently.
Then we realized that we could have, should have, would have done nothing. If the way these men were treating us was making us unhappy, then why should we be questioning ourselves? And "You can do better" was born.
We realized that if someone's behavior is a source of unhappiness or discontent, then not only would we be unable to change the person to make us happier, but it wouldn't even be worth the effort! So we made a list of everything that made us unhappy, everything that we should not allow ourselves to settle for, and said that if someone we were seeing belonged on the list, then we could do better. Sometimes it's funny, sometimes it's heartbreaking, but it's always true. And once it was written down, it was like a big dose of reality and empowerment rolled into one.
The purpose of "You can do better" is not to set impossible standards or refuse to compromise. "You can do better" is about not compromising respect and fulfillment. It doesn't matter if he's into you or not, but if he can't pull it together for you, then you can do better!
If he starts freak dancing with another woman at the surprise party he threw for you, then you can do better!
If you can tell that he's thinking about another girl while you're in an "intimate moment," then you can do better!
If he's married, and tries to convince you that it "isn't a big deal," then you can do better!
If he pulls out his special massage oil for when girls come over on the first date, then you can do better!
If he asks for your number while you're giving a presentation to the substance abuse program he is in, then you can do better!
If he has a Georgia O'Keefe painting on the wall because "he wants to show you how much he loves vaginas," then you can do better!
If he wants to tie you up on the bed he bought specifically for this purpose--and it's your first date, then you can do better!
If he think it's sexy for you to wear his ex-girlfriend's prom dress, then you can do better!