This hand looks like you've either tilted him into chasing you with bad odds, or he had an overpair and the double paired board scared him off.

Was this the only light river shove he's seen in the last few sessions against you? If not, then he might start looking you up light. And in this case, any pair would have you beaten. Given the stack sizes, he can also start playing lower cards IP against you for the great implied odds you're offering him.