Who knows why they didn't show up, nonetheless, I can understand if your feelings are hurt, because all they needed to do was extend themselves a little. Especially to break the tedium of being housebound and uncomfortable.
Real friends will show up. The ones that didn't show up-- well, you're friendly with them, but they may not be real, true friends. They didn't intentionally not show up, they just didn't get an A for being considerate. That's a difficult thing to absorb, and it feels lonely.