Hi! Can you recommend me some manga that a truly gay guy fell in love with a girl?

i also wanna know :)

The only one that comes to mind is 'The Four of Them". You can read it for free on Webtoon

That'll be spicy, but There's one where this girl basically turns straight men gay. It's called s-flower.

I actually read one but I think the guy is Bi
http://www.mangago.me/read-manga/ura_do_s_shachou_no_senzoku_hisho_h_no_toki_wa_kedamonokei/

really? What about the others? I mean if a guy likes it up the ally with a toy to be discrete you can't really say he's completely straight at least for me.