mtb, this is completely up to you. There is no right or wrong here. As I've stated, from my perspective, the on thing that justifies D in my mind is a PA. There is no doubt in my mind that she has crossed that bridge.
It is your MR. If you are not ready to give up on it despite her infidelity, no one can tell you otherwise. However, no one would criticize you for saying enough is enough. The ball is in your court, I think you are justified in whatever you decide to do.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018