Thank you for your response. You hit the nail on the head - I want to ask but don't want to sound presumptive.
I had contemplated saying something along the lines of... "At the risk of sounding presumptive... You has inquired about discarding condoms after your most recent testing... I know we discussed my comfort level in that regard. But it brought forth a question for me... I completely understand that at this point we're all free to see others - are you seeing someone else right now?"