Flush Multiway pot, Deep 2nd nuts

I don't think he would call flop then raise the turn with anything you mentioned like that, he played it like he has AT, when he calls the flop and shoves the turn id be worried about the nutflush but against this type of player I think you can just shove like you did, its defonetly the best play, there lines don't make any sense anyway, saying what I just said he probably could of done that with any of them hands you mentioned there nuts sometimes

What was his hand

It is a very small hand sample to make conclusions.
You are very deep, and I do not like to get all the money in without the nuts here. Villain makes a solid raise to our potsize bet on turn...

I wouldn't call the turn. So, either fold or shove. Since we are that deep, I'm honestly scared to put all the money in without the nuts. If he wanted to put the money in with a set or two pairs, he would probably raise the flop. I also don't think they will bluff in this situation. There is a chance that he has a worse flush, though. Rationally, I think it's better to fold.

This is one reason why I don't like to play very deep. Imo we can say that he is a bit too loose even tho we have just 31 hands. I think villain can do this with lower flush, set or even sometimes with 2 pair if he is a fish. I think I would shove here also.

We cannot say he is too lose when we look at a 31 hand sample...