That will be depend, normally guy will keep as nothing happen if he feel that you are not the type he want. Or only wait till he fall in love with you then he will slowly try to impress the gals, like helpful, concert his out look when meeting with you, jealous when you go close to other guy.

But guy feeling may be not so sensitive, as most guy are easy going, tidak apa attitude. Anyway if gal really like that guy, guy very curios, dress special for him, can try to cook sometime for him and etc. If a gal continue treat the guy nicely, normally he will slowly fall in love with that gal.

Guy seldom emotion, most guy stay cool most of the time. If he miss someone should be quite serious.
Most guy are too aggressive, and lack of expression technique. So very sorry all the girls.

It will really depend to a personality, some may shy, but some are enjoying together conversation, and like to gain understand to the girl.