It can be read in multiple ways - this is the problem with texts. He could just want to talk face to face and put this to bed. I don't think the texts that have been described are conclusively threatening - they could imply it but that could be a simple misunderstanding.
If you had a seemingly great friendship and it suddenly evaporated before your eyes because of a bit of money, would you be a bit confused? I know I would.
Solely based on the OP's description of events, this doesn't make sense unless this guy has gone off the rails. You can call it emotional blackmail or you could call it someone that is genuinely hurting and confused, and wants to resolve the situation and fight for this friendship that they value.
But this is an idiotic place to post such a question, because the obvious answer, based on limited information, is that this guy has lost it and that should be the end of it. But it's not. Why does the OP keep replying? Because he clearly values/valued the friendship. That means there's history and this isn't simple.
This post has a fraction of the facts, next to zero of the history of the friendship, and knee jerk reactions in nearly every post. Pointless thread is pointless.
And I say this as someone that already said to bin said person off (
https://forums.overclockers.co.uk/threads/looking-for-advice.19009373/post-38132235), but the neverending nature of this situation has changed my mind.