PokerStars No-Limit Hold'em, $0.02 BB (5 handed) - PokerStars Converter Tool from FlopTurnRiver.com

Hero (Button) ($3.89)
SB ($2.16)
BB ($2.03)
UTG ($0.85)
MP ($2.96)

Preflop: Hero is Button with J, J
1 fold, MP bets $0.06, Hero calls $0.06, 2 folds

Flop: ($0.15) 10, 4, 10 (2 players)
MP bets $0.15, Hero calls $0.15

Turn: ($0.45) 4 (2 players)
MP bets $0.43, Hero calls $0.43

River: ($1.31) 2 (2 players)
MP bets $2.32 (All-In), Hero calls $2.32

Total pot: $5.95 | Rake: $0.29

This guy had been playing super tight and aggressive betting pot every time prior to this hand. My read was he might be trying to bluff with a PP 55-99 or barrelling an Ax hand. Is my thought process wrong here?