What do I do about this?

My boyfriend recently got really sick with a viral infection in his throat. I'm trying to be as supportive as I can but it's tough since we don't live together and since his parent's don't know about me. He's going to be attending university in September and since his parents don't know about me, it's going to be hard for us to meet each other. We had plans this week but since he's sick we had to cancel them. I'm sad that he's sick but I'm also disappointed that our plans couldn't work out. I'm worried that I won't be able to see him that much especially since this week was one of those rare opportunities to see each other. I just want to be by his side right now, but can't help but feel bummed out by our plans flopping. I don't want him to know I feel disappointed, but I'm the type to wear my heart on my sleeve and will let everyone around me know how I'm feeling. Is it normal for me to be a little upset over us not meeting up? And how do I make sure I keep this to myself without making him upset? I don't want him to get upset over how I'm feeling.