Well for Meli only Diana (she lost her memories and only actually truly loved king) that one girl that’s a keeper he never actually liked her and then all of Elizabeth reincarnations but it’s the same person’s
For Percy eh, like all the people that like him have a valid reason and he doesn’t really know or pay attention to it fully, and he just revealed to love someone and let rose down softly
You're forgetting the female druid that stored his powers and Merlin who also had a one sided love, Diane thankfully got her love even if the author said he didn't plan the couple. So yeah many females liking one guy, lots of history on the series as you can see.
Really, another one character that has to fall in love with one guy, bruh this trope is the same as Percival and Meliodas. Now even the lady of the lake, so uncomfortable