Should I be worried? (20+ only please)?

I met a busy guy 3 months ago. We talked about getting into a relationship right after summer classes are over at the univerisity. We have verified the last day of class and everything. He said that after the last day of class. He will no longer be busy. Well I texted him the day after last day of class. He just pretty responds with short texts. On top of that he doesn't even try to hang out.

I'm just confused does he not want me anymore?
Now I can say that because it is an iphone. I can see that he's not maliciously ignoring me. Because you can see if they have read the text but it's been 4 days that he hasn't read anything after the last one about hanging out.
He could be busy but why did we just confirmed a few days ago that he's 100 percent free?

It's summer time, he wants to keep his options open. You do the same, and ignore him a bit. Don't be mean or sad (that'll turn him off) but as if he's on your list, but not on the top nor the bottom

My friend sometimes does this
they say they are one hundred percent free but then something just comes up and they have to do it. And he sometimes just doesn't respond to dumb random texts: c

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