I limp UTG with , one or two calls and BB raises to 5. I re-pop to 16. BB Calls.
BB is 63/20 Preflop, But has a PFA of 0.8, after some 40 hands. I have 130 and he has 100.

Flop comes (35)
He checks, and I bet 18, he calls.

Turn (71)
Check, Check

River (73)
He bets 45, I fold

My flop bet was basically an stupid way of trying to take down the pot cheaply. If I bet somewhere around potsized, ans he calls, the pot would be ~100 and I would have 55 left. Hard to get away from?

If I check the flop, I get no clue on where I stand. And if he bets the turn, and river I have a hard time calling him down. And at the same time, his preflop raise range should be pretty large. Even from BB.

ON the river it is a must fold right? I cannot think of a single hand that I would beat. (AJ, JT or 99, but they are very unlikely)

How would you play it?

Sure he could be bluffing, but that's a crap board and you only really beat QQ and AJ.

Yeah good fold imo.

Is was a cheap river with your Aces, the bet and PS in a vaccuum. You just couldn't beat anything against a guy who never bets to play a board like this as he did.

Don't limp reraise in 6max, it makes your hand too transparent. If it is likely that someone is going to raise, raise anyway, may be thee will reraise you.

I alos think that flop check is abetter play on such a board.
I would even recommend to check turn too if OP checks, you don't need to take this pot with a CB, your hand has a lot of showdown value, while you are not happy to play a big pot here.