I invited two friends and their partners over for a late lunch last Saturday. Friend 2 is notoriously flaky but said she and her partner would be there. That morning, I sent a text to confirm she was still coming and to let me know asap if not as I would cook less food or invite another friend in her place (we have a small flat so only space for six people comfortably). She said yes definitely. It got to lunchtime, Friend 1 and her partner arrived and Friend 2 didn’t show. No explanation, no apology, nothing. Two days later I still haven’t heard from her. She does have form for this - she will often cancel last minute. But to not even let me know, especially after my text that morning, feels particularly hurtful. AIBU to think I should reluctantly give up on this friendship?