You've got your roles exactly inverted here. The UK left screaming, huffing and smashing the door but apparently expecting the same benefits they enjoyed beforehand, as a rational person the EU would have no reason whatsoever to entertain that behaviour let alone reward it.

The EU has no rational reason to be especially sweet on the UK, and looking internally and at the future it can't even be seen as that as it would bolster eurosceptic movements inside the Union.

There's no point of view under which being soft on the UK is rational.