Why would a guy suddenly remove me from snapchat?

Anonymous
Me and this guy met through social media. We started talking briefly before we found out we were attending to the same college this fall. Not long after, he asked for my snapchat. We added each other but it was late at night and he didn't snap me until the next day. He sent a selfie saying " hello beautiful" we snapped back and forth throughout the day. Our conversation left off with me mentioning my job and he took about 3 hours to respond and all he snapped was a picture of the highway with " back!" and I left him on opened. Today, I posted a picture on my story of me wearing a college shirt from the college we are both attending and he swiped up saying " I see you" I replied saying " lol yea" and he opens it and unfriends me. It makes no sense to me, why would he suddenly unfriend me?
Why would a guy suddenly remove me from snapchat?
2 Opinion