Hi,
Go after your heart and intuition.... not always the "signs / signals" are obvious.... typical signs: He'll be embarased, lose his words, be shy, wish to spent much time with you, be generouse with you, devote time and effords to you, go out of his way for you, go several extra miles for you, "dance" around you, trying to please you all the time, speaking about your future, introduce you to his family and friends, goes with you to all the places he likes (movies, theater, sports, journeys, shows, bars, dancing), willing to sacrifice for you, etc. At the bottom line it's your heart and intuition to decide.
Best regards,