Alright,
The way it's generally done these days with OLD is:
few dates,
if keen at this stage then establish exclusivity. This doesn't necessarily mean you 'know' anything but you are mutually excited about the match enough to not see others whilst you see how it goes/ have sex.
If it doesn't go anywhere, call it off
If the connection sticks, it either continues as is indefinitely or some people 'make it official'
From personal experience, interest sufficient not to want to keep looking actively online or going on other dates may lead somewhere, early ambivalence generally doesn't. Others may disagree.
If he meant let's keep this open as in let's keep dating others then that's fine, it's honest. I wouldn't take it as real enthusiasm. There aren't that many genuinely strong matches. Many will give their attention to a good one even if it doesn't work out. Two dates in is early but the good relationships I've had, it's been clear there has been potential from the off and I've wanted to be exclusive, that's the thing.
If you're not sure that's what he meant, clarify.