People say "We need to hang out!!" then never contact you.
Vast majority of the time, in my experience, it's girls doing this. (No offense to any female gamer comrades who may be on here, as this is only my experience.)
I've learned to just say "Yeah, text me some time!" (putting the responsibility on them) sigh in exasperation when I never hear from them, then move on.
I used to follow through and take initiative to try to set something up (they're the ones who said they wanted to!) then, when they'd leave me hanging so long I'd fall on my face, cry