What to do when my bestie ignores me?

I love my bestfriend but she's already in relationship so I kept my feelings innside. But the issue is nowdays she only talks me whenever she needs something from me. Earlier she her relationship wasn't in good shape so I guess she talks me all the time to not to feel being lonely. But now after their relationship became perfect she totally ignores me until she needs anything. What's more painful? I actually help her whenever she needs even though I know after that I'll be getting ignored again. 😟
This is killing me from inside and whenever I try to tell her, she indicates me that she'll leave me forever and I can't let her😭😭
What to do when my bestie ignores me?
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