Is it normal for a guy to be "territorial" and protective over his girlfriend?

[Jordan]

My girlfriend hasn't had any relationship before me, and If some guy I know liked her before talks to her, or just any guy she knows starts flirting with her over facebook or whatnot, I tend to feel kind of hurt I guess. It's more of I don't her to talk to the guy because I'm scared of cheating. I also just don'f feel right when anyone is doing something with her, like flirting, holding hands, hugging, etc, even if the person is a professional, if they're discussing something of sexual nature, or say she needs to take some clothes for something like an ecg, I'm very annoyed well in that case if its a male although anything more and I would be offended whether the doctor is male or female. I know the last part is a bit immature, but I have a very hard time trusting people (I trust about 4 people, 2 with everything) and I'm working on that, but it's itching at my head knowing that there's so much I don't know about her still.

[Max]

Normal, but incredibly stupid

[amadeus21]

Yes my boyfriend is just like this. In a way I feel very comforted in the fact that he cares so deeply about me. He has expressed that he has never felt this for anybody. And people say that but it's true in this case. On the other hand sometimes I feel smothered and controlled but I can see through his eyes that he truly does care about me. We are in this for life together so I have just accepted the fact that sometimes you have to just accept people as they are. He is giving himself and me a great future and he only has my best at heart. You just gotta trust if you treat a girl right she'll be all she can be for you. Trust and respect that's all it is.