Why would a girl say a guy is bitter after a breakup?

We still live together and she tries to tell me to get out the living rooM so she can go to bed and I’m like I still rent this too and I have equal rights to this. Also I’m not a child so she isn’t gonna tell me to leave the room. She goes your just being bitteR because I broke up with you why does she think she is so high and mighty

Why would a girl say a guy is bitter after a breakup?
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