Jasmine flowers don't open

I have a Jasmine plant in a pot which is about 5 years old. It's been outside and survived winters but I have just re potted it, fed it and bought it indoors as it had some promising flower heads, some pinkish,  about to open. Not so. They never seem to get to the stage of opening which seems to happen every year. Its so frustrating given I have re-potted and fed it.