Alex was adamant about not getting a Queen, even if he had the responsibility to produce an heir that would rule the continent once he was gone.
There were reasons he didn't want a queen, one of which he told the elders very clearly. It was because he would never leave his family behind even if he got an heir.
There were also other reasons that they weren't aware of, but they were very aware that they absolutely could not bring up the topic without him getting angry for some reason.
So, when he said that he just hadn't found a good enough woman to become the Queen, they were immediately confused and somewhat angry even.
How could he find a good enough woman when he didn't even bother to search for one? Still, the two elders kept their composure and watched out things would turn out. After all, they knew Alex wouldn't lie in such a situation for no reason.