The talks failed. That's the ONLY thing we know for certain because he's still at Inter.
What if the talk went like this;
Spurs to Agent: "We are interested in your client coming to us, would it be possible to discuss this?"
Agent: Yeah sure, I'll run it by my Client to see if he's interested."
Spurs: Great, we'll contact Inter then to see if they're interested in selling."
Spurs to Inter: " we'd like to buy your player, would you be interested in selling?"
Inter: "Sure, if the price is right."
Spurs: " We'll offer you £65M."
Inter: "That's a fair offer, we'll sell as long as the player wants to leave."
Agent to Spurs: "I've spoken to my Client and he's stated that he doesn't want to leave, whatever the offer."
Inter to Spurs: "Sorry but the player wishes to stay. We would have been interested, but we can't and won't force the player out."
That's not talks breaking down. There has to be some form of negotiation for the talks to have 'broken down.' As soon as one party indicates that he has no interest in negotiating, there's absolutely nothing there to break down. Nothing happened.
How you're unable to grasp this concept is a mystery to me.