I have been on three dates with a guy I really, really like. He can be very slow replying to texts, but other times quick. We haven't talked all weekend, and he is travelling today and tomorrow. I sent him a funny message tonight, and he's been on WhatsApp but hasn't read or replied to my message for a couple of hours. Is this a sign he's not that hot for me? I become anxious around people I really like. So not sure - should I be worried or not?