Long story short:
Met a guy online, lots of chatting and Zooming over a couple of months, we have a lot in common and got on really well. Met in person twice for walks. After a bit of confusion (he admitted to sending mixed messages) we agreed that we were only going to be friends. All fine.
Anyway, one week on, he messages me yesterday on Whatsapp saying "I will completely understand if you're busy but if you want to walk tomorrow let me know". We exchange many messages during the day with chitchat, and discussing and arranging where to meet. I told him I was visiting friends for a BBQ early evening and would come back to him to finish the discussion later in the evening. I do that, responding to some comments he made, and none of my messages have delivered. This was last night.
Before I jump to the conclusion (highly likely but surprising) that he's blocked me, does anyone with technical knowledge know if there could be any other reason why messages wouldn't be delivered on Whatsapp for 12 hours?
I'm fully prepared to accept that I dodged a bullet if he has blocked me.