How important is the fidelity in a relationship?

The fidilety I think that is on e of the most important thinghs in a relationship because if your boyfriend or girlfriend is unfaithful it means that he or she don't have respect for you and I think that the respect is the most important think in a relationship is the respect to your couple because if one of the cuple don't have respect to the other, slowly the love it's over.
There are many people who forgive the infidelity but are different ways and you can decide if you forgive the infidelity or no, but I know that when you love a person and that person is unfaithful is so difficult to broke the relationship, but if you forgive the infidelity is normal that ou at the moment forgive but as time goes by the relationship begin to cool and finally you know that you can't forgive the infidelity.
In conclusion, the most important in a relationship is the respect and if you are unfaithful you are disrespecting your partner.