Bf actually disallow me to travel with my girl friends, what could be the reason?

It could be he's very possessive of you. In a bad way. He could be trying to control your life, he could also be very insecure and wants to compensate for something by using and controlling you. He probably wants to have power over someone, unfortunately he's set on you. I suggest you don't get into a deep relationship with this guy. If you do he might make your life miserable. A boyfriend shouldn't be like that. He should let a girl do what makes her happy, not deprive her of her freedom.