Is a guy who breaks conversation to say hello to people coming in the room not interested in me?

More than one guy has demonstrated this behavior. We'd be talking one on one at a table in a pub, being the first ones there for a group meeting. He seemed interested in our conversation, yet at the same time always on the lookout for other people (men) about to join us, and he'd forget what we were talking about if someone did join. If he was attracted to me, would he still do that, or would he not notice other people walking into the room, because he's so captivated by our conversation?

Is a guy who breaks conversation to say hello to people coming in the room not interested in me?
Is a guy who breaks conversation to say hello to people coming in the room not interested in me?
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