I'm guessing that's Parker is maybe BI, he did mention he has a feeling for girls. Probably he did date some girls or maybe he's still finding his own sexuality???
God knows he's so pure and discipline.
He's the only character that does not touch into that deep dark secret like the other 4 mains.
Maybe he just said that cause he does not want walter to find out his sexuality and parker didn't even know that walter is gay on that day if i remember walter reveal it to parker on day 6