Well I only suggest to move on if the guy isn't interested or isn't following through like wouldn't reschedule or call back or doesn't sound seripus. I don't want you to waste your energy on something that doesn't sound promising. I wouldn't advice to move on if something is going well. Like if the guy wants to meet you or wants to talk or you met him and it went well, id never say to move on. I'd suggest you go for it!