Many will answer that I have that faith in my partner. That is good. At least they have that faith. Many of you will not be sure about the answer and quite many know that they cannot have faith in their partner. Does your partner have faith in you? Why don't you ask this question and find out the answer? Please ask him/her - Darling, suppose I have someone else in my life for a short time and then come to you and confess will our relations remain the same? Will you forgive me and forget what I did and accept me? Will we be together as we are today? The answer may differ from person to person, but you will rarely find a partner who accepts this.
As you broke his/her faith, how can you expect that their faith will remain intact? That you can expect them to support you after you betray them? That sounds difficult. Faith does not work that simply. Faith works on commitment. If you are committed to your partner and if your partner is a reliable person of integrity, you may have faith in him/her to a certain extent. To say that my partner will always be with me under all circumstances is difficult to say. Only few are lucky to have such partners.
What should we do? Draw an agreement verbally. Commit yourself fully and ask your partner to have faith in you always. Ask him/her to commit that you can have the same faith in them. Give proofs from time to time and you will win unshakeable faith of your partner. Once you have that faith, you will feel a great sense of relief because you are sure that your partner will never leave you.