I thought about spliting up?

So i've had this thing running in my mind a lot lately, my girlfriend stopped texting me 1st lately and whenever i try to setup dates she just cancels off, also i feel like she takes me for granted even tho she likes to show off the fact we're dating for quite some time and she's realy loving sometimes but every other day it seems like she cannot care less.
I thought about breaking up with her even tho i know it will break me mentaly,
Help me please.
I thought about spliting up?
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