one card straight facing a river CR

[RollinHand]

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can someone explain why? isnt this a good card for him to CR bluff? also the fact that he CRed 4x my bet amount seems like he wants me to fold.

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Sure, but it can easily be the other way around depending on how skilled he is.

Why the flop check btw? Just mixing it up I guess?
He probably doesn't give you much credit for a hand for starters, I don't think he can put you on one TBH. And it's difficuly for you to call with a straight here if you would happen to have one.
I think it's safe to say that you won't have a flush here often at all.
I also think there's a good chance he has a straight himself, that would explain the big raise.

I would just fold though.