Girlfriend goes out clubbing only without me, and its literally every night?

Anonymous
First of all thanks for your time if you are reading this.
Its like this: Me and my girlfriend are in a relationship for 2 years and we are both 23 years old. She lives with her brother, I still live with my parents but am about to move out on my own soon. However, she has a hometown where she grew up and her parents live, which is around 200KM away from my hometown where she's situated with her brother. Occasionally she visits there and stays for a few days or 1-2 weeks sometimes. My problem is that, she has some problem or not sure what, she just can't stay at home - she's always out for a walk or out for shopping or anything, just not to be home. Especially when she goes to visit her parents in her hometown, she's out every night, clubbing and getting drunk until 3-4 am. Literally every day when she's there. When she's in my hometown I've asked her quite a few times to go out in a night club or go out together at some party, she always rejected telling me that she hates clubbing and parties, and would just go on a casual walk with me. She hasn't invited me yet in her hometown, which is making me feel bad after 2 years. I've told her on a few occasions that she goes out too much and she notices that i change my mood whenever she goes out, but she just tells me that "i am forbidding her to go out", even though i never said that and goes out either way, or she just acts like she doesn't care and nothing is happening. Also when we go out together for a dinner or anything, she never bothers to dress up - just wears normal jeans and a tshirt, while when she goes out there its always miniskirts and the clothes I never get to see her in. (which i get it she might be comfortable around me but still?) I rarely go out on my own, because I dont have many friends, so she never has to worry about me being out. Why is she acting like this and continuing to do everything and acting like she's not that worried or doesn't care/cold when she's around her parents (her hometown)?
Girlfriend goes out clubbing only without me, and its literally every night?
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