the problem is that as I understand,for Now they haven't found another immmortal, well at least a MALE one..
Maybe even if they found any.. theywould be too arrogant, too young or smth like that, which makes Horo not wanting to comunicate with them..
Or maybe, knowing her character (actually not knowing would be more like it..), she is just more interested in how things turn out.. since eternal life can prove to be boring even when there's 2 living together.. and since humans dont have such a life span, their life in the eyes of long'livers would befull of activities.. which makes them more interesting..
That would be my answer