Spotsandstripes, if things progress and become serious and you both then decide to become exclusive to each other than i would be suspicious if he or you still wanted to keep your profiles open as when you get to that point you just have to throw suspicion in the air and take a gamble at love and then if it goes boobs up, then at least you tried and gave it your best shot as every relationship can't be a winner.
I wish you good luck in the future and hope you find what you're looking for and deserve.