I miss my busy boyfriend?

My boyfriend and I are very early in our relationship and things are quite new for us. Our story is typical. He used to text me every day, we'd FaceTime a lot, and he opened up to me about some pretty dark stuff. I even stayed on the phone with him until 4 in the morning consoling him once. And as you probably guessed, our communication dwindled. His spring break ended and he's been getting swamped at school lately *I'm in high school, he's in college* and as a result, he's been a stressed, anti-social mess! He hasn't been hanging out with his friends, talking to anyone, NOTHING. I checked in with him two days ago to see if he was doing alright and he said he was just stressed out. I told him I'd leave him to do whatever he had to do and that I hoped to talk to him soon. I haven't heard from him since and I haven't seen him in almost a week. I know it's only been two days and I shouldn't overthink it, but I'm concerned he'll end up losing interest in me.../: How can I communicate to him that I miss him without seeming needy?
I miss my busy boyfriend?
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