Oh I know that feeling... I've gone from scale to scale and they all seem to read differently from one another. One thing I have noticed though is to stay away from the cheap ones at Wal-Mart... They always give me a different reading no matter what I do.
So I'm sure you all know the doctor scales and the ones at you can find at most gyms. The one where you move the bigger bar and then the smaller bar to find an exact weight... Well my bf's mother has one. Talk about scary accurate. Right down to the 1/4 lb. And if you're worried your new scale will be more, jump on one of those. Ouch. It was not pretty. My scale was WAYYYY off... Almost 10 lbs. And not in a good way. But I've decided to stick to it because it's always accurate. No idea how much they are though. Which might be even scarier.... Lol.
You just can't let it get to you. You know you are losing inches and really that's all that should matter. I know what you mean about him getting on your nerves. My bf sat on a video game all winter and lost 20 lbs... and likes to rub it in. I did the same thing and I think I gained his 20... Lol. But he does support me also. They just don't always seem to understand how sensitive we are when it comes to weightloss. I'm getting more away from scales now. I just like feeling healthy.