Does he try to control you?
One of the most important thing in a relationship is for a woman to never lose her individuality or her independence. She should be able to make important decisions for herself and not allow her partner to make those decisions for her.
Once you see that your partner is trying to control who you see, where you go and what you do there is cause for alarm. This is not normal behavior and you should never accept it because before you know it he will take full control of your life. Talk to him about it and tell him how you feel. If he reacts with aggression and insists on controlling you then you need to rethink the relationship.