I think the OP is heading the right decision by working things out with the BF on the whole "Selling items together" plan. You should still keep it a "clean" break through out the process.
You guys should still have an agreement already in place once all the items you guys plan to sell are nearly sold.
E46 M3 vert CB | Cinnamon | SMG
E92 JB | Bamboo | 6MT |