Yes, if you need reduce your gain, you will need to report your closing costs from when you bought the house. If you qualify to exclude your gain and the gain is less than the $250,000 exclusion, you don't need to dig for more expenses.
You will report 100% of your 1099-S, since that was split between the two of you. You will report 50% of your original basis and closing costs, as well as any other shared items, such as remodeling costs.
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