Lately my friend’s behaviour had been bothering me a lot.

I have been friends with a girl since my teens and have always noticed that oftentimes she acts entitled, ungrateful and rude with everyone around her. She is also a very quiet sort of person and doesn’t have any other friends beside me and he husband . I sometimes let it slide because she’s my friend but lately I feel that she judges me. I am a big yapper and I go off topic a lot. During one of these moments I felt like she was secretly recording me to probably send to her husband.
The more I think about it, the more her actions from the past seem to bother me.
I consider myself a somewhat social person and I mostly reply to strangers who greet us on our daily walks. I don’t mind small talk with retail folks and think its basic to thank the cabbies after a ride. My friend doesn’t do any of that and gets mad at me for engaging. She doesn’t have friends because she only talks to people when they can help her. Most times they don’t because she doesn’t ask nicely. She thinks she is cool and she is an introvert and she doesn’t need society. But its killing me to see that she’s got no humility and since we are always together, I am doing the courtesy talking for the both of us.
I want to stop being friends with her because I cannot seem to make her understand that there is something wrong with the way she is doing life.