Women what would you do or say to help assure you are a good loyal woman that stays committed to your spouse, and would treat them right?

Let's say your loving and caring boyfriend or husband has been cheated on, used, and lied to by previous partners he tries not to let it bother him and how he thinks of you but naturally like anyone thats gone through that its hard to trust after that and believe other wise in a new partner. So what would you say or do to reassure him that you really love him and won't cheat, use, or hurt him in anyway?

For guys looking for a woman to be with for a long lasting relationship, I'd say this can help them a lot if they are looking for signs the woman they are talking with is committed, and a actually caring woman.
Women what would you do or say to help assure you are a good loyal woman that stays committed to your spouse, and would treat them right?
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