I could be wrong but I believe you’re already second guessing the idea. You wouldn’t wait or make this post for unless you were unsure, which I understand, I get it. These are difficult decisions that we rarely face in our lifetimes.
You know relationship talks at this stage do no good. To be brutally honest, she left you and there’s OM in the picture but you said “I don’t want her to think that I am ignoring her.” I just don’t know if that makes much sense AT.
Finally, I have followed your “sitch” from the beginning. It’s an honor to have you in the same freshman class, you’re a very sharp guy, that’s very evident. I think most of us get to a point in our sitch when we are “done.” We want closure and you need to figure out if your TRULY ready to break the ties between you too. I don’t think it’s a wise choice UNLESS your TRULY ready to move on.