[ QUOTE ]
I put Seat 10 on trips or two pair because he didn’t raise pre-flop. And I thought he was trying to stop me from drawing a flush.

[/ QUOTE ]Welcome to the forum. If he was trying to stop you from drawing to a flush, he would have raised your flop bet given the two diamonds on the board. So, I don't think you can attribute his all-in to an attempt to stop you from drawing.

As a side note: he can't have trips since the board is not paired; he can have a set, however.