"Without trust, words become the hollow sound of a wooden gong. With trust, words become life itself." ― John Harold
Trust is that special ingredient in all our relationships, be it with one's parents, spouse, or children, which makes their foundations stronger. Without trust and commitment, no relationship can ever become successful.
However, building trust in a relationship does not happen overnight; it has to be constantly worked upon every single day. Although it takes years to build trust, it may take just one mistake to break it forever. But, is it possible to make someone trust you back again, if you have lied to them or cheated on them?
If you are still in two minds about whether or not this relationship is what you want, give it some time. Be very clear about your feelings first. If somewhere you feel that your partner is not the right person for you, convey it to them and decide on whether you'd still be staying in the relationship or breaking up.
Take full responsibility. Apologize to your partner by looking them in the eye. Of course, your partner will be very hurt at that moment, so do not expect them to believe you. They might even react aggressively.
However, maintain your calm and listen patiently to whatever they have to say. Do not give any reasons or make stories on why you cheated. Just admit your mistakes.
If you had an affair because something was lacking in the relationship, tell your partner about it. If at some point, you felt that there was a lack of romance or fun in your life and that's why you had an affair, discuss with your partner as to how you can bring the spice back.
Be empathetic and sensitive towards their feelings, and be there whenever they need you. If they have any professional problems, always lend an ear and a helping hand. If you are reliable and always there for them, they will slowly start trusting you again.
Your partner may be very angry and withdraw into a shell or may simply walk out of the relationship due to your infidelity. You never know what's going to happen, as you are dealing here with a broken heart, with feelings and emotions. If you love your partner, make efforts till you get them back; not just physically, but emotionally as well.