Is it wrong to not want to be friends with a girl who has a boyfriend?

Anonymous
I met her BEFORE she had a boyfriend. We used to hang out a lot -- as guy-girl best friends (go to the movies, to eat, etc.), but now she's spending all her time with her boyfriend, even spending the night at his house. Should I tell her that I don't want to be her friend anymore?
Updates:
9 mo
I like her romantically, but I haven't told her yet. I can't imagine her spending time with another guy.
Is it wrong to not want to be friends with a girl who has a boyfriend?
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