It's funny - my partner and I have been together for a bit over 13 years. We actually started going out while my collecting was on hiatus (between about 1991-1996), where I just lost interest for a while. I got back in when Beast Wars came out in 1997.
It all just kind of ramped up from there - she's never really understood it, but she's pretty supportive overall. I never really had to break it to her - one day I just had all of these toys, and she had to adjust.
SofaMan - Occasionally Battling Evil with his Mighty Powers of Indolence