Disappointing result for Billy

Around three weeks ago we had Billy (now 19 months old and the KC reg Cavalier, I bought in last year as a pup) heart examined. No murmur was heard on auscultation, but when his heart was scanned. He was found to have a Mitral-Valve Prolapse Grade 2. The cardiologist comments were "Mild intermittent mitral regurgitation noted. No other defects." 
This could be congenital, never get much worse (who are we trying to kid), it could be the start of fast onset Mitral-Valve Disease MVD or it could be slow onset MVD. The history of the breed I would think it more likely that it is the beginning of MVD and we can only hope that it is slow not fast onset.
Devastating news, more for Billy than me. 
A few days before his examination, I was contacted by a lovely couple locally looking for a pup or would be interested in an older dog. I contacted them about Billy and his predicament and them knowing all about MVD, having had a Cavalier with it. They are prepared to take him on. 
He has been out with them three times now, the last time jumping in the car ready for the off without any prompting. He has been to their home twice to chillout with them. I had Billy castrated last Wednesday and they are now just waiting on him being healed from the operation. He is going to have a super home.
Devastating as this is to me and has made me question breeding anymore with the year we have had with the dogs. I don't need any pity because, ultimately, it is the dogs that suffer more than any dog breeder ever does.

Billy at five days post being castrated