I do not know but I am not convinced Robert and Aaron will actually break up and in some ways I would prefer they didn't and them to sit down and discuss everything, I do not excuse Roberts ONS it was unacceptable and unnecessary. What I feel is, if Robron are the "end game" then the old on/off/on/off is old hat, redundant & boring.
I would much prefer them both sitting down and discussing in detail Aaron's dreadful ordeal in prison plus his other insecurities which of course include Robert's infidelities. Robert to discuss his distress (after the discussion they had that we didn't really see any problems with to warrant an ONS but they both thought they were over) when he felt abandoned, desperate, lonely and how he cannot live his life without Aaron. I don't think they should be promising never to do certain things again I just think they need to state that they cannot and do not want to live without each other, they are in love and need to work through things.
In ED land I think this approach doesn't/wouldn't really fit as it wouldn't cause enough angst and upset but it would be rather refreshing and new.