This post is triggery as F for me. Full warning.
I confessed my two month affair to my husband, about 2 months after it ended. I delayed it long enough to get in IC, not understanding how I got from Point A to Point B and wanting to get my head together. But, even at my foggiest, I completely understood that to regain my own integrity I needed to confess. It wasn't contingent on whether or not the marriage would continue. In fact, I knew if it would continue that the best possible chance I could give it would be to confess.
I stand by that decision today. To save a marriage you have to be willing to lose it.
I say this because you need to abandon all your fear based responses, including the ones as the BS.
Without having proper accountability and the restoration of your integrity, you are going to continue to struggle, and will likely continue to escalate this behavior until you finally find your exit. This is going to wreak havoc on your sense of self, and until you do the work you will continue to struggle in relationships.
I find that *some* of the same work has to happen whether you are a BS or a WS. A lot of it is finding your worth and self love after infidelity. So far, you have only looked for that under rocks, and you are damaging yourself in the process. You are prolonging healing by distracting yourself. That is WS 101.
Now, for the other shoe -
My husband went on and had an affair for 18 months. I suspect that he felt just as vindicated as you in doing what he wanted without telling. I found out by intercepting some suspicious texts where the AP was talking kind of in code. I am not a dumbass, where there is a code there is a reason to have code.
I am not condemning you, but it's important you recognize that NO - it doesn't really always have an impact on how you find out. I read something like 90 or 95% of affairs are discovered by the BS through finding out on their own or from someone else. It's not an indicator of success.
I will say that TT and multiple DDAYs DO have an impact, and can definitely erase progress. But, I find what you are doing by distracting yourself with others is not time well spent towards healing. The goal is to love yourself so much that you will institute your own boundaries and make healthy choices for yourself. What the WS is doing or not doing is not indicative of whether or not you can heal or not.
I will say, that my husband probably started out the same way as you, and it esculated. To me the only difference between a short term or a long term affair is when someone gets caught. So, it's worth noting that I do think you did a strong thing in ending it without being caught, but I think you need to take some accountability for yourself. You are a WS who needs to overcome some of these poor coping patterns you have. The avoidant nature you are demonstrating.
Your husband said what he said about doing what you need to do to even the score because he hoped you would. He wants you to even the score because that takes the heat off of him. It doesn't even the score, it creates more damage, which says he really has no clue.
I think you need to be asking yourself different questions rather than looking at what you can point at that is keeping you from healing. It's not this.
When was your second dday? Was it broken contact or TT?