My girlfriend is rarely in the mood to have sex anymore and doesn't want to ever talk to about it, what should I do?

I love my girlfriend and I would do anything for her but for the past 3 to 4 months she just never want to have sex amymore and I feel like im doing something wrong and it also makes me feel like she is not attracted to me anymore. Everytime I try to talk to her about it she always gets really defensive and mad and tells me she doesn't want to talk about it or tells me she doesn't know what to say or doesn't know what to tell me and then it turns into a big fight. I just want to know what the problem is so me and her can try to fix it. I want to be with her but I can't if she never want to talk about our problems and try to fix them together. I just need help with what I should do.
My girlfriend is rarely in the mood to have sex anymore and doesn't want to ever talk to about it, what should I do?
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