Secret - maybe, depends how far along the chats were - if you'd talked about meeting up with someone but hadn't got as far as arranging a time/place yet then yes. If you'd just said 'yes I like Harry Potter too' then no. Chats just stop, no explanation given or needed, usually.
There is an expectation that meeting up with someone for a date will lead to a second, third, marriage, kids etc - it's rare. First dates are to see whether you want to spend more time with someone to get to know them better. That is all. Second dates are to see whether you actually like them or not, whether they pick their nose when they think you're not looking, whether they are hideously racist or actually believe they ARE harry potter. Third dates.. well I haven't got to a third date in the 3 months I've been doing it. Offers, yes :)
If they make you feel uncomfortable during the chatting, or during or between any of the dates, it's unlikely to work - as Teakozy says, there are red flags flying in the kingdom of the mushroom people.
Maybe it'll work with one of the other guys you're chatting to, maybe not. There are, as they say, plenty more fish in the sea.