Is this a trivial fold?

Villain is a solid player. Not a pro, but a thinking player. His first hand he lost AA vs KK when kings flopped a set. I don't know if he's tilted, but we were were chatting and it's obvious that hand is still wearing on him.

Blinds: 2/5/10 (Straddle: $10) Hero: UTG (J♥️ 7♥️) Villain(s): UTG+1 Effective Stack: $1,200

Preflop ($17): UTG+1 raises $35, Hero calls

Flop ($77): J♠️ 7♠️ A♣️ Hero checks, UTG+1 bets $20, Hero raises $80, UTG+1 calls

Turn ($237): J♠️ 7♠️ A♣️ 3♣️ Hero bets $160, UTG+1 calls

River ($557): J♠️ 7♠️ A♣️ 3♣️ K♠️ Hero checks, UTG+1 bets $350

Total pot: $907

I hated this river as the draws all complete and AK makes a better two pair. Villain offers to show 1 card, the Ad. Obviously a super strong play, but it also makes it harder to fold since his value range is narrower. Would he really just flat AA, JJ, AJ on the turn?

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