Well that's not out of the ordinary. Fabregas left Barcelona when they where not that great, so after seeing what he miss he wanted to go back. Romeu leaves when they are great, so he knows what he wants....more game time! It's the same issue for our youngsters. Take the example of Scott Sinclair. Was at Chelsea for so many years, but left for more opportunity. He is doing good at Swansea, but do you think he wants to come back to Chelsea today? NO! He wants to continue playing and become great. And maybe in 4 to 5 years time he will assess where he is at. And if he is at a great lvl and want to move to a bigger club then he will. While as to Romeu, there is not many choices after Chelsea. And if he is not going to be a first team starter, then any smart man will stay here!