ESA already had the ATV to do what CommercialCargo does. But because of cost they stopped that program and instead helped with the Orion service module. They a

ESA already had the ATV to do what CommercialCargo does. But because of cost they stopped that program and instead helped with the Orion service module. They are committed to Orion service module and have no interest in going back to cargo resupply. Given how close the ISS is to the end. By the time they would have finished a new cargo ship, the station is gone be close to gone. And they simply don't really have the budget for CCDev. It simply doesn't fit in their budget. And even worse, given how absurdly high the cost for the Ariane 6 are, you would expect 6-10 billion for a crew capsule. And you know the European would go for some dumb space plane idea that's gone cost even more.