Ex's - How do you deal with them?

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I am in a relationship with a wonderful man who has a psychotic ex. They have a child together and this individual is just plain crazy. She has vowed to do or say anything to get me out of his life. She has tried, but unfortunately I am much more stronger willed than she apparently gave me credit for as we have now been together for going on 2 years. She is such a vindictive, spiteful, hateful person. I have recently been babysitting their daughter so as to save my partner from having to pay out any additional money monthly, saving them both about an additional $250 per month. I am doing the very best I can to be civil to his person despite everything she has done to me, including spitting in my face; but as time is going by I am beginning to have some bad feelings about her and I am afraid that 1 day I may slip up and say something that will jeopordize my partners extra time with his daughter. I am scared and could really use any advise on how I can continue handling this ackward position that I am in. I feel that so far, after everything she has done that I have been more than cordial and controlled myself very well, but am unsure what to do if these feelings begin to get worse. Any suggestions would be greatly appreciated. Thank you to all.