If he is excited about pursuing us, this means we don’t pursue others, correct?
I’m going to assume that “he” isn’t a bounty hunter and that “we” are not a roving band of serial killers.
Someone liking you isn’t a good reason to date him. It’s appealing, I know–you don’t have to work very hard, because he’s already into you, and it removes that icky does-he-like-me-or-not stress from the start of a relationship. But if you’re interested in other people, you’re under no obligation to be faithful to one guy unless you’ve agreed to it. Just make it clear to Mr. Pursuer that you’re not exclusive.