I accidentally left out 5 oz of freshly pumped breastmilk for probably 5.5 hours. Should I keep it, or throw it away?

Gi

I accidentally left 5 oz of pumped milk out for... around 5-5.5 hours? The fat was already separating and was on the side of the bottle, too. Should I use it or throw it away?? Ughhhh

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