How is there antifreeze in my oil?

So my 97 honda civic was leaking oil a lot so I replaced my head gasket but when I took the head off my whole engine was filled with oil mixed with antifreeze. My pistons and everything else were okay but what would cause this and how can I fix it?

Leaking water pump seal.
Have the cooling system pressure tested.

Well if the head gasket was busted then that's how the antifreeze got there. Or how do you think an engine is cooled?!

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