2nd pair against shortstacker that played hand weird NL25

[Jailblazers]

Poker Stars, $0.10/$0.25 NL Hold'em Cash Game, 5 Players
LeggoPoker.com - Hand History Converter

UTG: $23.45
CO: $24.90
Hero (BTN): $25.25
SB: $9.10
BB: $42.15

Pre-Flop: Q[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] dealt to Hero (BTN)
2 folds, <font color="red">Hero raises to $1</font>, <font color="red">SB raises to $1.75</font>, BB folds, Hero calls $0.75

Flop: ($3.75) K[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] (2 Players)
SB checks, Hero checks

Turn: ($3.75) 6[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">SB bets $1</font>, Hero calls $1

River: ($5.75) 5[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">SB bets $3</font>, Hero ?

No reads on villain.

Min3betting preflop narrows his range alot to mostly premium hands.

Flop: I check behind because I don't want to have put in any more money when it's likely that he is going to check-raise me all-in.

Turn: Donk bet is too small and I think it is too weak tight to fold there because I'm ahead of hands like TT, JJ. But he may also be doing this with AA or AK(slowplaying) or AQ.

River: So he is representing a decent hand on the river. I don't think he would be 2barreling with any hands we beat so our plan is what. Fold?