He doesn't open my snap but his score goes up?

kaldunks
So this guy and I have been snapchatting for a while - kinda off and on. He had a crush on me last year but nothing ever came out of it, even though I told him I like him. Anyways, now we are snapchatting and I have the yellow heart with him. But I noticed that he won't open my snap sometimes but his score will go up by two, meaning he's snapping someone else. I don't want to sound paranoid but I just want to know why someone would do this. Is is trying to get the yellow heart with someone else? Does he just not want to take a selfie? its kinda annoying and i just want to know if im wasting my time. Also do you guys do this?
Updates
+1 y
He eventually opens the snap the same day, so it doesn't seem like he's "ignoring" me
He doesn't open my snap but his score goes up?
2 Opinion