It would make sense if some were interested in me and others were interested in each other instead.
Well, you are the player, the hero of the story, so of course they're all interested in you - well, depending on their reputation. Not all of them were interested in me in my playthroughs.
And Lae'zel happily goes off with either Wyll or Astarion (depending on who you're romancing). Although she is not too happy about Wyll afterwards. haha!