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I would probably fold to this bet. Expecting that the hands my opponent does this with includes a significant portion of better flush draws (typically the nut flush draw). This reduces the equity of a call considerably.
You also need to improve even when your opponent only holds a blocker to the nut flush, such as As3d. Or overcards. So you barely have the correct odds vs the worst bluffs in your opponents range.
In position in a three way pot your opponent should either check behind or make a standard continuation bet. I prefer checking. Does not see the value of jamming with a low pair vs two opponents.