Most Helpful Guy
Maybe that's worked before in the sense that it's forced him to come to the negotiating table like a defeated army, but I doubt it was more effective than that. In general, not talking is a poor way to solve relationship problems. If you don't learn to tell each other your problems, you won't fix them.
Most Helpful Girl
Don't get back at him or ignore him back, sorry to say this but that's the most childish solution I've ever heard for something like this.
You shouldn't have to use that sort of method to get him to treat you decently.
Being sick isn't an excuse for him being a prick and there was no reason for you to be ignored; he's just seeking attention and acting like a child.
I'm gonna go ahead and guess this is a highschool relationship, there's your first mistake... Girl, you deserve better. Maybe he's not ready to properly support you in a romantic way.
Since you're asking for solutions I would recommend talking to him about it seriously, and trying to have a mature conversation about it and how it made you feel. If he doesn't respond to that like... oh, I don't know, a decent human being... break it off, because he isn't ready for a relationship lmao