I have waited to respond to this post so that others could throw in their two cents first.
Kaart, thank you for the PM on this hand.

I think we should be having more posts like these. It will benefit all of us to see what's going on from both sides of the table during a hand.
Here is what happened on this hand in my head. ( Scary, I know )
Just prior to this hand I was in a hand with jadie56. ( Sorry I don't have a HH because I'm at work ) I had 8-8 and raised 4x BB in the SB and he quickly called. ( No limper's, just us HU ) Flop came 10,4,4. I bet out 4x the BB and he quickly called again. Turn was a blank and I bet another 4x BB and he called quickly again. River was an Ace. He wins the pot after showing A-K for a bigger two pair.
He told me that I let him stay in the pot. I felt that his calls were not smart especially the call on the turn. He was risking chips fairly early in the match on a draw with only a few outs. He got lucky and I wasn't happy.
Now I get dealt this hand. Kaart just calls the BB and Rat limps in. Now we all know that Kaart is an aggressive player. He has already raised pre flop multiple times in this game with marginal hands, so I'm thinking that he might actually have a hand this time and is trying to trap me.
(WRONG) That is why I checked the flop.
On the flop I hit a 10. I know that I'm way ahead now, so I'm going to turn the slow play back on him. ( I still think he has a high PP ) I check and he bets 3x BB, so I call.
On the turn comes a third spade. Obviously I didn't want to see an over card or a spade. Now I think I've screwed myself. (Nothing new) I check hoping to keep my loss this time to a minimum if he did have spades. He bets $450. I see this as an over bet and he didn't have spades, now he's trying to buy it.
(WRONG AGAIN) So I call.
River brings another 6 and I got a boat. Now here is were the hand with jadie56 comes into play. Like an idiot I think here's my chance to regain some of those chips that I lost to jadie56. If I bet out Kaart is going to fold unless he has spades in which he might call, but if I check and he does have spades he will bet and I will raise resulting in more chips.
(WRONG YET AGAIN) So I check only to have Kaart check as well.
I'm sure that Kaart didn't put me on a Full House. He's good, but that's a Daniel Negreanu call and nobody here at THF is Daniel. (Sorry Kaart) I think the only reason that he checked the river was because he was only Queen high with his flush. He could have only been worried about a higher flush. Now if he had the Ace high flush then I'm certain that he would have paid me off.
The reason I've added the information about the hand with jadie56 is to show how much another hand can influence a future hand. My mentality about this hand with Kaart was to regain chips from the hand I had lost previously to jadie56. That is something that you should never do. I know this, but I did it anyway. Overall it probably ended up costing me some chips. If I would have bet something on the river Kaart may have called, but by checking and hoping for a chance to raise, I got nothing more.