Responses
he's definitely bi or pan, but looking at what he said from another perspective, I don't think he's that wrong (even though, i wanted the author to made him know he's bi/pansexual) like..
if you are together with a man, as a man, you're in a homosexual relationship.
if you are together with a woman, as a man, you're in a heterosexual relationship.
How to know a straight person wrote a lgbt character without previous research
http://www.mangago.zone/read-manga/hishakaishindo/uu/m_chapter-6/pg-36/