How to cope with a clingy, controlling girlfriend?

I love her to pieces but it's getting out of hand now. She won't let me see my friends. If I do, she won't speak to me for days. She sulks if I spend time alone. She expects us to spend every waking minute together. She complains that I don't compliment her enough, even though I tell her she's beautiful and that I love her every day. She accuses me of looking at other girls, even though I have reassured her I do not want anyone but her. She has not dated anyone before me and is quite emotionally immature. We have only been dating for 7 months but I would of thought things would have calmed down by now. If anything, they seem to be getting worse. Any advice?

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