I Have a Crush

So I’ve liked this guy for 4 months. And I noticed him always acting sketch around me- like he would stop whatever he’s doing to stare at me or he would purposely bump into my sometimes. Other than that we’ve never talked. And so I decided to add him on snap and he began sending me snapchats and then he stopped all the sudden, however, whenever I did see him at school he would stare still. And just a week later sent me a snap after he stopped snapping me. He sent another snap to me yesterday. And just today, I saw him at school and he was acting really approachable but I was nervous to talk to him so I didn’t. And when I checked Snapchat later on, I noticed he unadded me off of snap. I honestly don’t know why he would do that.