[A_Brandybuck]

I agree here with JennyHallu. We must think in other dimensions talking about the behaviour of Gandalf. And of course, not only in things which concerns Gandalf, Elvish things are also 'different'.

Gandalf is really old in thge measurement of Men. So, I think it is just normal for an Istar and for any immortal person, respectively, being absent from home for some decades.

Remember the marriage of Galadriel and Celeborn. It was not a big thing, that they are physically divorced for years as she went to Lothlorien. And after the War of the Ring Galadriel departed into the west and Celeborn remained in Middle-earth.

Of course, love is a diffenrent thing, but I think that is still comparable here for the measurement.