Weird [censored] 5/10 hand

[Kyle]

Villian in this hand is pretty fishy. No stats though. He has 1K I cover.

5/10 6 max

Villian min raises UTG, I cold call OTB with 65s, we take flop HU

Flop comes down 4 2 10 one of my suit.

Villian checks to me I bet 3/4 pot(39), villian min raises, I call.

Turn comes another 4 giving me a flush draw. pot=208

villian bets 50, I call.

River comes a K of spades completing my flush.

Villian pushes 700ish into 308 pot, I go WTF and?