There is a particular wound that arrives when betrayal happens to someone who was trusting God through it. Not just trusting a person — trusting God. Praying about the relationship, asking for discernment, believing that faith was a form of protection, operating on some version of the understanding that if you were doing the right things spiritually, the worst things would not happen to you. And then the betrayal happened anyway. And now you are sitting not just with the wound from the person who hurt you, but with a question about God.
The question takes different forms for different people. Sometimes it is anger: where were you? Sometimes it is confusion: I thought I heard from you about this person. Sometimes it is a quiet, devastating realization that the framework you were operating in — the one where faithfulness produces protection — does not appear to be how things actually work. Sometimes it is all of those at once, cycling through in no particular order, each one arriving again just when you thought you had processed it.
The church often handles this wound badly. The response tends to be explanatory — God had a plan, it will produce growth, your faith is being tested — and the explanations arrive before the wound has been received. Each explanation, however well-intentioned, functions as a kind of minimization: your pain is worth less than the theological point being made about it. That minimization is its own secondary wound. And it leaves the person with their original question unanswered and now also feeling that the community that was supposed to help them has failed to understand.
The honest answer to why God let it happen is one that scripture does not shy away from: it does not give a satisfying reason. What scripture does, consistently and throughout its entire length, is show people who trusted God and still suffered — and show God remaining close to them in the suffering, not explaining it away from a distance. Joseph trusted God and spent years in slavery and prison. David trusted God and fled for his life from people he had loved. Job trusted God and lost everything. Jesus trusted God completely and was handed over by someone who had eaten at his table. The pattern in scripture is not that faithfulness produces protection. The pattern is that God is present in the suffering that faithfulness does not prevent.
That is a harder answer than most people want to receive. It does not resolve the question — it changes the question. Not: why didn't God stop it? But: where is God now, in the middle of what happened? And the consistent answer to that question, across the entire span of scripture, is the same: close. Present. Not absent. Not indifferent. Close to the brokenhearted — which includes the brokenhearted who were faithfully trusting God when the betrayal arrived.