John,

I have stopped playing online. I used to play tournaments on Party and Pokerstars. I won some and I lost some.

The thing is that even though I can't prove there was cheating going on, it just didn't feel right.

In a brick and mortar cardroom you can be cheated, but at least you have some chance to see it going on. On line if another player could see yopur cards (or the cards to come) either because the house was cheating and allowed him to or because he had been able to hack the sight, you will have no chance of catching him.