Villain is 37/25/2.5 over 300 hands or so. I get the feeling he's not a donk, but those stats are very loose. This was an almost insta 4bet from him. I've not been at the table long but haven't shown down anything bad yet.

What the hell do I do here?

Ultimate Bet No-Limit Hold'em, $.50 BB (6 handed) Hand History converter Courtesy of PokerZion.com

Button ($47.50)
SB ($53.90)
BB ($83.45)
UTG ($23.40)
MP ($70.10)
Hero ($50.70)

Preflop: Hero is CO with , .
1 fold, MP raises to $1, Hero raises to $3.75, Button raises to $13, 2 folds, MP folds, Hero ???

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This is a pretty easy fold for me as the guy 4betting us isn't the original raiser.
I think we see the monster pairs far too often here.

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