My boyfriends snap score keeps going up, but he leaves me on delivered for a long time. He's also active pretty often. What does that mean?

Sometime's I'll be on delivered for half of the day. He'll text me on imessage, but barely respond on snap. So of course I overthink

My boyfriends snap score keeps going up, but he leaves me on delivered for a long time. He's also active pretty often. What does that mean?
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