best friends bf

Hi,
So me and my best friends have been like sisters from 12 years old 7 years ago we are so close but she got a bf last year and although I want to be happy for her I'm struggling 
She goes out with him a lot which I know is expected but I just feel sad and that I have lost her and thag I'm not important anymore 
We have friends so I can go out with them but she is always with him and don't text me when she is with him and I have good reason for this but I don't like him very much I just wanted to know if anyone does or has felt like this before and what I could do? 
Because I love her so much and I'm not going to talk to her about this because it's not her fault but she goes out with him obviously and I just feel that I'm not important anymore thank you

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