I haven't spoken to him in 2 days...

I don't know if it's normal??? He said he was gonna turn his phone off for the week and then told me he was never going to, he just said that to convince "himself" to stay focused on college applications before school. He posted us on Instagram last night but hadn't responded my texts the entire day! Then I replied to the post and he didn't respond to that either??? Then he texts me goodnight at 2AM this morning well knowing that I'm asleep and love when he calls me before bed. And on top of all this, he sent me a weird ass not funny joke about my grandma in an obvious attempt to make it better and so I didn't even open it. I really want to test as to how long he'll let it go because I don't want to be the one getting ignored, it leaves me feeling worthless. But shouldn't I be worried???? We've been together 6 months, now it just feels like he's toying with me especially since he's going to college next year and I'm a junior. Anyway MAIN Q: worry or nah???