My girlfriend is so mean?

i honestly don't know what to do, im at my lowest point, we met on Instagram we both have a tight schedule but we were good at first but after like 4 months she got so mean like no empathy at all , when we fight i always suck up and said sorry first , she would never do something like that, i love her and i don't have anyone else, she say the same thing but why don't she treat me like this? she is 23 im 25 , i always tell her don't be mean, im always kind and loving, i hope i will get some of that back even just a little but i think when we fight her true colours show up she just leave for hours she never think about my side,, i don't even feel like talking anymore , is there anything who can understand what im saying?
My girlfriend is so mean?
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