You resolve conflict through dialogue and meditation.
Examine which of your own egos are responsible for the fight. Then, if your partner is open, discuss what you've comprehended.
Reflect on what the appropriate course of action would be for yourself rather than having acted on your defects. Allow your partner to do the same if he is willing.
Remember that we must always respect our partner's free will, especially when we do not agree. Persuasion is a much more compelling force than coercion.
Fights occur because the ego tries to coerce the will of our beloved. Therefore, if both of you are practicing, the solution is to establish transparency regarding your own psychological work, not to wave a finger at our spouse's deficiencies.
If this is something you wish to do, speak to your spouse about how you want to change psychologically, not only for your own benefit, but for his. Recommend how this process will strengthen and improve your relationship together, because love is nourished through the death of desire.
One partner can do this alone. It is hard, but it is better than being a victim of our own faults. If both partners are practicing Gnosis, then you have a wonderful opportunity to clearly articulate the root of your problems and to rectify them through meditation and alchemy.
It is well known even amongst laymen that no communication contributes to divorce. Couples who do not talk about what concerns them end up repressing, bottling up, and suffocating their emotions, until when the right moment comes, they explode.
It is better to have some smaller skirmishes here and there than to end it all with WWIII. For that, you have to get comfortable with frequent, uncomfortable situations and conversations. You have to embrace conflict, not with the desire of defeating your partner and proving him wrong, but by elevating and edifying what is most noble in him.
You prevent disaster by speaking honestly about your own sufferings, concerns, and views immediately, so that your partner can listen to you. Then, absolutely, do the same for him, because while you might feel justified in your pain, there might be things you are doing that are harming him.
Samael Aun Weor often spoke about the need to never go to bed angry. This is because resentment is a weed that poisons the garden of marriage. You nullify anger by talking about your issues, and even meditating before and after the event, so that you comprehend what exactly is going on.
By relying on each other to clearly identify both your egos, you have an expedient means to end suffering and secure the happiness of your marriage, since if you both die to your egos, you both can become a perfect matrimony.
For thirty years I sought God. But when I looked carefully I found that in reality God was the seeker and I the sought. -Bayazid al-Bastami