I play every game to win. Not that I mind losing, I certainly do my share of it, but I play every game, and from the begining to the end of every game to win.
I have no objection to breaking a treaty or even pulling a sneak attack on a current ally. I can't remember once ever making a deal with another player in a game and promising anything other then to do my best to work with him to win. If I have, I probably shouldn't have because I likely would have turned on them if I felt it suited my purposes at the time.
Allies are only good if they are helping me to win. If an ally is strong enough and doing a good job he is helping me win and he will stay my ally. If he is weak, or I find another ally that can help me more to win I will switch allies. Or if my ally becomes too strong, I may switch, if I think it will help me to win.
I always assume every ally is planning on doing the same to me. I expect every turn they may turn on me if I am no longer serving their purposes. So I try to stay strong and suit their purposes. I want them to think always I am stronger than them, but not so much stronger that I am a threat to them. Only strong enough that I am more usefull as an ally then as an enemy.
I don't like sharing too much with my allies, because everything I give him is something he will use against me eventually. I know this because everything they give me I will use agaisnt them eventually.
I want my enemies and my allies weak. I want my allies only strong enough so that together we are stronger then my enemies.
And I don't keep track of who has broken treaties with me in past games. I have enough trouble keeping track of my enemies and allies in the game, I don't need to waste effort keeping track of who was my enemy in a previous game.
I don't mind losing, but I can't not try to win, or I don't enjoy playing. Even in a role play game, I will role play and try to win. Afterall, who can concieve of a race of beings that wishes to be exterminated? It may be possible, but I doubt they would survive to achieve spaceflight. And if they did, I wouldn't want to role play them.
All of this may not make me a very good ally, and probably costs me a few games. But I prefer it this way. I think it makes things more interesting.
Geoschmo