It probably means he likes you a bit, or is considering you. Basically, I'd say it means you were definitely not a 'no-no', in his eyes. However, it could just be one of those weird; I-don't-want-to-go-out-with-you-but-I-get-jealous-when-other-people-go-out-with-you situations. Basically, he may not be after you himself, but may suddenly find out that he does want to be with you, when you're with another dude. This is not a good basis for a relationship.
However, it does sound likely that he might like you...do a bit more digging...or say no, it wasn't your boyfriend, but that, *sigh*, you'd really like one....