Why has he stopped messaging me suddenly but watches my stories?

So a guy I’ve been on a date with, we’ve been messaging non stop for two weeks, one week post date! He was messaging like he was really into me, we even arranged a second date. He says he’s super busy with work which is true, he’s also had loads of stuff on.. however last night he saw my message and didn’t reply. He hasn’t messaged me all day but has posted a story and seen mine! I’ get that he’s busy but he’s gone from 100 to 0 I just don’t get it…
Why has he stopped messaging me suddenly but watches my stories?
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