In the form of a logic puzzle.
The solution to the German Tank problem states that if you confirm for certain that at least n of something exists, then the total amount of that thing is probably 2n. Therefore, if I confirm for certain that at least 1 guy likes you, then there are probably at least 2 guys that do.
Now, how do we know that the number of guys that like you are at least 1? Well, the same way that you know, when countin money and starting with a nickle, that you have at least 5 cents. You don't need to know the number, you just need to confirm that one guy likes you, and then you know that at least 1 guy likes you.
I am unable to assess to emotions of other guys, but despite that, I know for absolute certain that one guy likes you, and therefore that there are probably two. How do I know that?