25/50NL HU >300BB Deep Tough River Spot

[Arito]

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I'm checking back this river. Given his propensity to check-raise you, essentially w/ the nuts, AND the fact that you've not caught him bluffing EVER in this spot. I don't think I need to find any value on 5th street, as my flush wants a showdown.

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If he NEVER bluff raises on the river isn't this pretty much an easy bet/fold? You want value from your flush and you know you will not get bluff raised off your hand. The likelier he is to bluff you off your hand, the more I might consider checking. Then again, if he really likes to bluff raise the river than it turns in to a bet/call.

So basically:

Never bluff raise -> bet/fold
Some times bluff raises -> perhaps check behind, but probably bet/fold still
Often times bluff raises -> perhaps check behind, but probably bet/call
Really likes to bluff raise -> bet/call.

Am I way off here?