The problem is that this is your subjective interpretation of what YOU think the consensus is. This is what you think other people think is wrong. Why should someone on this board believe that your conclusions about the consensus are accurate, reliable, or valid? No one is interested in sorting that out. In contrast, the best information to offer here is experience, AKA a data point. Fundamentally your input here is suboptimal.
It's also really clear that what the consensus may be here would vary a ton by the actual situation:
1. Was the original relationship happy? Would the consensus be against this if it were an abusive relationship?
2. Was it just a casual girlfriend, or were they engaged?
3. Was the OP intentionally trying to seduce the girl, or did it just happen that they recognized it was a better pairing?
The reality is the consensus WILL differ based on the situation. There are a ton of shades here, but you fixated on the idea of "betrayal", as if all things with this pattern were uniformly bad. That's clearly not true, and there is simply not enough data for you to overfit and then moralize.
It's also really clear that what the consensus may be here would vary a ton by the actual situation: 1. Was the original relationship happy? Would the consensus be against this if it were an abusive relationship? 2. Was it just a casual girlfriend, or were they engaged? 3. Was the OP intentionally trying to seduce the girl, or did it just happen that they recognized it was a better pairing?
The reality is the consensus WILL differ based on the situation. There are a ton of shades here, but you fixated on the idea of "betrayal", as if all things with this pattern were uniformly bad. That's clearly not true, and there is simply not enough data for you to overfit and then moralize.