If you click on any message's mood icon, located at the top of every message, you will be shown a webpage listing all messages of that thread, including a column listing the replies to each message with an indication as to whether the reply has been answered. I suspect that SLPx posted the one word message "Freddie?" as a hint that he has posted replies to messages from you that you haven't yet replied to. Looking at the message list for this thread, it appears that that would be messages 33, 34 and 35.
There is no forum rule obligating anyone to reply to messages, and I offer no assessment as to the content of SLPx's replies (in other words, perhaps replies are called for, perhaps not, I am not saying either way), but within the bounds of available time meaningful threads of discussion should not be purposefully left hanging.
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--EvC Forum Administrator