breakup goggles
When you want to breakup with someone, but you start to remember all of the good memories you shared, and you think breaking up with them is not the best idea, even when it is.
Rob: I'm gonna break up with Jane.
Tahlia: That's a good idea.

*Later*

Rob: I don't think I'll break up with her, we've had so many good times together.
Tahlia: She's cheating on you, and she treats you like crap.
Rob: Yeah, but still..
Tahlia: Omg, you so have breakup goggles.