If you want to change the world you start by changing yourself.
If the LBS is with another person....their focus turns to that relationship as opposed to working on themselves. So for an LBS with the knowledge of the journey, we can make the conscious decision to not partake in another relationship.
The MLC'er is not making a conscious choice....there are underlying issues that cloud judgment. So the bandaid of another relationship is halting the realization of those issues...making their journey longer or worse case.....neverending.
The other issue you mentioned R2.....that is guilt talking. They see you making positive changes they didn't expect. So it had to be because of their behavior...self validating to speak.