Why do the single people suffer?
No weddings for three weeks? It’s not the wedding guests who suffer. It’s the unmarried! Who are we hurting?
I think there’s a bigger picture here. Weddings and Jerusalem share something very deep. It’s not a coincidence that two of the seven Blessings (Sheva Brachos) recited during the wedding week invoke Jerusalem. Or that the glass is broken at a wdding to invoke the loss of Jerusalem. Jerusalem and the Jewish Wedding are twins. When one hurts, the other one suffers.
The idea of union is what connects the two. Union between man and woman is connected to union between God and Israel. Of course we will return to this idea.