Cha Cha's feed

I think there are some points I missed in the plot which would help me appreciate the story more so I'd really be glad to get some answers abt:

So in highschool, did sungho not like dohyun romantically? Was he basically cornered into a sexual relationship to keep his interest going cuz he wanted his attention? Like I thought he also liked him but wasnt ready to do every sexual thing and was coerced into doing things he didnt want to do... thought that was the reason of his trauma.

Then I supposed like a trauma response, he got obsessed over him? I mean this part is open to interpretations, he could just straight up be an obsessed psycho and this would be his trigger or something like that.

Anyway another thing which wasnt clear to me is how their relationship ended, like did it get exposed? How did it happen? My guess was that sungho's parents read his diary and thus reported it or something like that but honestly I have no idea!

Thanks to anyone who's read up to this point...