Hello Friend, Good that you are seeking a help. Not that everyone succeed in love and it's not crime that you need to hide. It's quite common problem among your age group getting into long-term term relationships. In any relationship trust and fair communication helps in building a strong bond and relationships. Also you should not carry  this as a guilty feeling  through out your life. It's better to kill this before starting a new relationship. It's good to discuss this at  appropriae time with your partner to share your points and justification. If he is genuin he will accept it positive, but if not, you will know what kind of personality he is and anticipate future problems. You may take some guidance of close friends or external support like us to guide you.