
I can't remember if Giovanni still has his condition or he was cured of it

Yes this reply of mine is actually true and to proof it here https://www.mangago.zone/read-manga/heating_up/hs/iur_chapter-77/pg-1/ this is where giovanni lost so much blood that felix donated his blood to him cause he has the same blood type of giovanni

He's having paranoid thoughts. He thinks after he gets cured, Felix's feelings will change and leave him, also because there's no more use on getting warmth from him if he's cured. I also think it's because he developed abandonment issues after he was sent to the orphanage. He said lines like this, because he was really scared Felix will leave him, also this was said in his thoughts, so Felix didn't know what he was thinking:
"I won't let you go. So you should hold on to me too. Even my birth parents abandoned me, so there's no guarantee that you won't abandon me too. You can't leave me [on days like this] because you're soft-hearted. The warmth that you give me is enough for me."
He's really paranoid and scared, poor Gio. Also, he said "On days like this" because it's already rainy season in the manhwa. And Gio gets really really cold on rainy seasons.

I am putting alot of faith in this doctor and giving him the benefit of the doubt. Everyone thinks he is a snake but i honestly feel that he is just massively insecure about being tied down. Hopefully he doesn't hurt our little bean.
Also, i want to see more of all the brothers together! They look like a disfunctional yet tight family.
I would hate to have something in real life like a Fated Mate. Imagine throwing yourself on someone you barely know because their pheromones are the most compatible with you, regardless of who you hurt in the process (current lover, their lover, etc)