You don't have no stinking king

[colgin]

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giving up second pair against a flop bet from a very loose crazy player is giving up too much, I think,

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I don't see how folding here in an unraised pot, with a very vulnerable hand on a two-flush board can possibly be giving up too much. This seems like an easy fold to me.

Call the river. Raising there makes no sense as you are probably splitting at best and if BB is bluffing your raise will not be called.