When men lose interest, it is often because they feel too much pressure. So to add even more pressure is not a good idea. Even if you want to know where you stand at that moment, give him some space to make a choice. This way you will increase the chance that he will eventually choose you.

Do guys lose interest in their crush?

It might sound harsh, but its actually totally normal: everyone has their own unique set of dating dealbreakers, and its OK to lose interest in a crush (or even a long-term partner) if you discover something about them that you simply cant overlook.