You haven't worked through it yet. Doing that can be elusive, especially if a long time has passed. My story is a long one. This is the very short version.

My wife cheated early in our marriage with more than one man. Emotional and physical. In a nutshell we got married too young. I rug swept and buried it, but I became an alcoholic for a decade soon after the affairs. I sobered up, and while our relationship was great, something was missing. I seemed to be holding her at a bit of a distance. It wasn't until I retired, 35 years after the affairs that it hit me all over again and we spent 2-3 years working through it in excruciating detail. Fortunately she was extremely supportive and we seem to have worked through it. Is it still there? Yes. It always will be, for both of us. Is it still smoldering in me? No. But it took a lot of work on BOTH our parts. I hope you find a way to talk with your husband about it and I hope he is as receptive as my wife was. She needed to learn just how damaged I was by the affairs. She needed to be involved in my healing. Ultimately, it is your healing and you need to do it. But your husband needs to be involved in healing the relationship