How do you feel about one-sided friendships?

I talked to this girl for like almost two years. We got along pretty well but I just always found myself texting her first and asking her out to different places. She'd always tell me about the things/trips she planned to go with HER friends. I've never been over to her house but now that she has a boyfriend, he goes all the time. After awhile I felt uncomfortable. I stopped texting her recently and I don't hear from her at all as figured.
How do you feel about one-sided friendships?
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