Should I say good bye to her before I unfriend her on FB? Or Should I even unfriend her at all?

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Basically this girl who I use to be best friends with a year ago ignored me several times when I talked to her or posted on her wall on FB recently. I also tried talking to her on skype or through IM and such.

She is a long distance friend and we were best friends for like 2 years till we stopped talking. We use to talk and cam everyday and it was fun. But now it's obvious she doesn't consider me as a friend anymore because she ignores me.

Should I unfriend her? No point in being friends with someone who ignores. If I do should I drop a message like saying how I know you don't consider me as a friend anymore but you were my best friend and best of luck to you in life?

What do you guys think? I know unfriend seems a bit too much but REALLY what is the point if the person doesn't even respond to you.

p.s she is clearly ignoring me