LOOOL maybe not XD ! (orrr they just decided to keep quiet so Frisk won't feel embarrassed XD)In any case I'm glad you noticed (I was kinda expecting from others to write about it LOOOL :3)Yeah he's a bit innocentIt's also a part of his psyche XD He mostly spend his time around Dremmurr family and being a nanny of children so...flirting comments and suggestions fly by him and he just didn't notice them or take a longer time for him to realize XD and in comics react on them in funny manner XD(He will also incredibly blush while insisting that he is NOT cute or adorable XD)But also while being confronted, it will be later revealed that he actually even doesn't want to consider any deeper feelings others have for him. Her feels horrible of wanting to kill Frisk and other humans in the past so he sees himself as a demon and sometimes even pushes others away from him who are trying to get 'too close' to him (in his eyes he is protecting both: them and himself). He is afraid that he might hurt others like he did in the past...and also because he didn't want to be hurt himself and experience another feeling of loosing someone again.