A funny,''hypothetical'' Singles+Dating Question<for 10 points+I'll answer your Question>?

Let's say you met someone online, you know he's a real person who is very good at your major interest and you start liking him.. You message each other for months every day but then suddenly you start getting replies more rarely- exactly every 2-3 days and then sometimes even after 5-6 days..Would you automatically think it's something you did, they lost interest or they're indeed so busy as they say when you asked them? And what would you do to make things back the way they were? Cause you may worry that if things continue like this you may stop talking eventually and that is something that in this story you wouldn't want to of course.. Any ideas?