First we must know, what is fidelity ?, is not more than being honest in facts and words to your partner, be it (e) boyfriend (a), wife (or) or just that person to whom you are fine.
Second, to be clear about what you want to achieve with that woman or man in the future, third, without forgetting that there are temptations.
For that you must:
-Delete all the contacts with which you had adventures or pretended to have them.
-Don't give your contacts or networks to those you see as a temptation.
-Avoid being alone with anyone who catches your attention or creates attractive (or).
-Do not talk for more than 30 minutes with someone you think smart or cute (or), of things in common or personal, because it can cause attraction. *
Therefore, if you find yourself in a situation where you feel that the situation will win you, then run, run away. It is better to call her a coward, boy, mannered or weird, to lose everything safe for five (5) minutes.
If you do and fulfill each of these tips, then you can say that you are Faithful.
"EYE" do not forget that you need to have values, to value what you have and value yourself.