Just ignore Seho. I know they mean well, but they aren't paying attention to anything that is being said and just repeats the same statement again and again.

Something I did think about, which I found interesting, is that Halsin says that no one shares his bed at present. While that doesn't necesarrily mean monogamy, Halsin does give them impression that he chooses his thrysts with some care (I refuse to all it a relationship at this point). This is further supported by "you are all I want" - but that concept of him actually caring about who he sleeps with also goes entirely out of the window by act 3.

Everything that has any sort of emotional worth is diminished to soemthing meaningless.