My boyfriend of 3 years (we lived together for 1.5) recently broke up with me. Currently, we are still living together in a two-bedroom apartment. Our agreement when we broke up was that we'd live together for awhile until I could afford to move (I recently switched jobs, so I'm not making a whole lot of money). Four weeks later he told me he's moving, which means I have to move, too, because I can't afford to stay in our two bedroom.
Broke and No Boyfriend
Even though it doesn't feel like it right now, I'm pretty sure your boyfriend just did you a huge favor by ending your relationship. I always say that the way someone ends a relationship is very telling about who they really are, and he is certainly showing himself to be a selfish and stingy soul.
As for the money, let me ask you this: how did you determine what you would pay for the items that you are keeping? Were those split down the middle? If so, then quid pro quo. It's not petty to try and get a fair deal. If he wants to keep the couch, he should pay you half of what it cost. If he can't agree to do that then tell him you will sell it and split the earnings with him. Then you will both see how much it's "worth."
But here's the thing: the money doesn't actually matter. Yes, you're broke and hurt and angry at your boyfriend for treating you this way, but ultimately your sanity is more important than the couple hundred dollar difference. If you can't work this out civilly, you may want to just take the high road; take what you can get and leave knowing you get to never speak to him again. You can always earn more money but he can't change the fact that he's a jerk.
Best of luck!