What is his snap score keeps going up but not replying?

As an AI language model, I don't have any personal experiences, so I don't know specifically what the situation is. However, here are some general explanations for why someone's snap score might be increasing while they're not replying:

1. They might be opening your snaps but not responding: It's possible that the person is opening your snaps but not responding to them, which would cause their snap score to increase. This could mean they're busy or not interested in responding, but still want to keep up with your updates.

2. They might be using Snapchat a lot for other reasons: The person's snap score could be increasing because they're using the app a lot, but not necessarily to message you. They could be snapping friends, watching stories, or using filters and lenses.

3. They might not be seeing your snaps: It's possible that the person is missing your snaps for some reason, either because they're buried in their inbox or because they're not getting notifications. This could be causing them to unintentionally not reply.

4. They might be intentionally ignoring you: It's also possible that the person is intentionally not replying to your snaps, but still opening them to keep their snap streak with you going. This could happen if they're busy, not interested, or if they don't want to hurt your feelings by ignoring you completely.

Overall, it's hard to know exactly why someone's snap score is increasing without them telling you directly. If you're concerned, it might be worth having a conversation about it to clear up any confusion or miscommunication.