In a new relationship, is it normal for a couple to be with each other 24/7?

My friend/housemate has a new girlfriend, and we are all worried because she has asked him to cut off his friends for her and choose between us and her. They started dating two months ago, but she is ALWAYS round at his (our) house, and gets angry if he spends time with us. They are together 24/7 and we have tried to talk to him about it because we miss him, but she talks "for" him. We never see our friend anymore because she doesn't want us around. Is this normal, and if it's not what should we do?
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Hi all, apparently also she hit him a couple times and he hit her back? I don’t know I wasn’t around in the house at that time, but apparently they get into physical fights as well. I’m just concerned for my friend, I think his girlfriend is crazy
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I appreciate all your advice. We got his best friend out of all of us to talk to him, but the girlfriend has kinda turned him against his best friend by making him choose and saying “what a horrible person his best friend is”.

I think she’s the horrible person. I just don’t know how to make my friend see it. He’s besotted by her for some reason.
In a new relationship, is it normal for a couple to be with each other 24/7?
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