R is about the future, not the past, but ... changing from cheater to good partner is difficult at best. I would think it's even more difficult for someone with habitual cheating for over a decade.
I'd change 'R is possible if you both want it it' to 'R is possible if you both want it enough to do the necessary work.'
BSes need to process the pain - the grief, anger, fear, shame, whatever - of being betrayed out of their bodies. That's usually complicated by a need to work through a lot of resistance to letting the pain go.
WSes need to take themselves apart and put themselves back together. Short sentence; very hard work.
My reco is look deep inside to determine what you want and, if you want R, to determine how likely it will be that your WS will do the work they need to do.
At the same time, my reco is to start feeling your pain, because feeling it lets it go.
You heal you.
Your WS heals them.
Together you heal the M.
The good part is that you can heal yourself whether your WS heals themself or not.
You say 'therapy'. Is that MC or IC? MC treats your M, and your M didn't fail - your WS did. That implies he'll probably need extensive IC to heal himself.
One thread that helped me a lot at first was https://survivinginfidelity.com/topics/324250/things-that-every-ws-needs-to-know/. It allowed me to compare what my W was doing to what an 'ideal' WS who wanted R would do. I actually printed it out, removed the SI info (which printed out as header and/or footer), and asked my W to read it.
fBH (me) - on d-day: 66, Married 43, together 45, same sex apDDay - 12/22/2010Recover'd and R'edYou don't have to like your boundaries. You just have to set and enforce them.