gallifreyburning:

ilovesuperwholockstuck:

tardistrouble:

RTD era:

Moffat Era:

TASHA: (to Clara) I have confidential matters to discuss with the Doctor. Would you excuse us? 
DOCTOR: Anything you have to say to me, you can say in front of Clara. Well, quite a lot of it. Probably about half. Maybe a smidge under. Actually, Clara, would you mind waiting out here, please? 

Yes. This is a thing called character development.