I'm lost and confuse. Advise please?

I'm at the point where I'm not sure what should I do in my relationship. Whenever she is in a problem situation, I offered my help stating my opinions because I'm an overthinker so I look in many different pov but when I need help from her, she just plainly says, "I don't know". If I pursue on asking why she don't know, we will ended up in a fight and I'll apologise to her in the end. I don't want to go the option of finding another female because it's cheating and I find it cringe sharing my problems to my male friends. Should I just keep finding answers in Google or should I do something about it?
I'm lost and confuse. Advise please?
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