You speak of a lack of desire, and you call yourself a poor wife. Yet I would not have you weigh your worth so heavily upon this one faculty. Marriage is a union of souls before it is a union of bodies. You say you love your husband deeply, that you support one another, and that you have never felt more connected. Is this nothing? Do you think that the vulgar passions of the flesh are the whole sum of love? Far from it. The kindly affection, the patience, the mutual bearing of burdens, the shared life in Christ, these are the marrow of marriage. Do not let the modern world deceive you into believing that if your body does not burn, your marriage is any less real or holy.
You ask whether this condition touches your standing with God. It does not, unless you allow it to corrupt your heart. God has not commanded that every wife must feel a constant fire, but He has commanded that we love one another, that we bear with one another, and that we fulfill what we have promised. You consummated your union; you do not withhold yourself from him out of contempt or rebellion. The difficulty you felt, the sorrow you have, these are not sins but trials. Carry them with patience. Offer this struggle to God, who knows our frame and remembers we are dust.
As for the word “asexual,” be wary of such labels. They often encase a person in self-pity or self-justification, and they can quickly become a cloak for avoiding duty. Do not let a term invented by the world become your identity. You are a Christian woman, a wife, a follower of the Crucified One. Your identity is hidden with Christ. If you must name your condition, call it a cross, a portion of weakness that humbles you and turns you toward the Giver of every good gift.
Now, I do not scorn your prayer for a return of natural desire. It is fitting to ask God to restore what is beneficial, if it be His will. But do not tie your peace to that outcome. Perhaps He will grant it, that your husband may be comforted and you may find a new joy. Or perhaps He will withhold it, that you may learn a deeper love, one that serves not from appetite but from deliberate will. In either case, your duty is the same: to love, to honor, to be faithful, and to communicate openly with your husband. Let him understand your heart, and together seek a path that guards both his frailty and your conscience. If you both can, with prayer and agreement, live in continence for a season, that is not sin. But if he needs the comfort of the marriage bed, then you must not despise that need, even if your own body feels no urgency. Act with compassion, as one who serves the Lord and not merely her own feelings.
Remember that the highest road is not the one that feels pleasant, but the one that leads to Christ. Often He permits us to walk a steep and painful path so that we might cling to Him more tightly. Do not measure your worth by the world’s incessant chatter about passion. Measure it by the grace you show in clinging to your vows when the feelings are absent. That is a sacrifice pleasing to God.