What should you do when your best friend chooses her boyfriend over you?

One of my best friends and I are really close and are like sisters. Now that she has a boyfriend, she will only hang out with me as a last resort. She won't even text me back or return my calls. I know we're growing apart and I'll except that. I just don't know whether she's as good of a friend as I thought she was. I just don't understand how to handle the situation
What should you do when your best friend chooses her boyfriend over you?
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