Help to build trust with my man

So my man has been CHEATED ON a couple times in past relationships. I have never been cheated on or cheated on someone.. i am fully committed to my man and committed to being faithful ... with that being said I am wondering what I can do to build that trust with my partner. How can I help him to believe that I am not going to cheat on him? To those who have been cheated on and have entered new relationships, what has/can your current partner do to build that trust?