One of the quieter effects of discovering infidelity is doubting your own judgment: how did I miss this, why didn't I see it sooner, can I trust what I think I know. This self-doubt is common, and it's worth addressing directly.
Hindsight isn't the same as evidence you ignored
It's easy to reinterpret ordinary past moments as missed warning signs after the fact. Most people who are betrayed weren't ignoring obvious signals, they were extending reasonable trust in a relationship, which is what most people do.
Rebuilding judgment takes practice, not just time
Confidence in your own perception tends to come back gradually, through small decisions that go well, paying attention to how you feel around certain people, noticing patterns, trusting a read on a situation and having it hold up. Journaling or talking through decisions with a therapist or trusted friend can help you notice this progress.
Be patient with a slower trust process
It's common to become more cautious, in this relationship or future ones, for a while. That's a reasonable adjustment, not a permanent flaw. Many people find that trust returns, just on a more deliberate timeline than before.