Over the past 20 odd years of playing bass I've had many spells of leaving the bass alone & playing guitar, keys or whatever but always found after a few months, I'd go back to it (sometimes it was 6 month spells).
From about 2003 to 2006 I hardly touched my bass (I didn't even have a decent amp to play through) & spent most of my music time sitting in front of a computer with Reason on it.
Then a chap at work said "you play bass don't you Graeme, fancy having a jam?", the rest is history. Now I love playing bass more than ever & can't see me putting it down ever again.
I do play acoustic guitar in another band, but I'm trying to get someone to replace me so I can play bass.
I just like the fact that it's a humble instrument. No one acknowledges you're playing but they do when you don't.