Hello Forever_Yours and welcome to the group
I think it's meaningful that you led with describing your family of origin ("FOO"). Our early family experiences can calibrate what we think of as "normal" for relationships -- and can acclimate us to accepting dysfunction because it feels normal and familiar. Over time, many of us here who join for other pwBPD (an ex, a partner's ex, a child, a boss, a friend, etc), come to realize that our family members may also have challenges. It makes a lot of sense that you felt like you were trying to figure out how you belonged in your family experiences.
Your current situation sounds complicated, to say the least. If I'm following you, you started a relationship with a man who didn't exactly reveal that the client he worked for was also who he had been sharing a bed with for over a decade. That would be shocking to find out.
I have been happy to try and meet his terms and conditions -- but this one I can't meet. He seems glued to her even though her condition would normally have her getting the care she needs in a home, and now I am on the outs for objecting to that plan as too risky.
And am I understanding correctly that the condition you can't meet is -- he's fine with continuing to "care for" his "client" in the home with the current setup (bedsharing)? And you're OK with his other conditions for RVing together, but this one is your "line in the sand"?
And, given that disagreement, he has decided to end the relationship with you?
Am I heartbroken? Yes and no, because I now realize that this relationship was doomed from the start, it began so beautifully and hopefully, but ultimately he wants his cake and to eat it too. I can accept I made a mistake due to my own desires and I became a lightning rod in a toxic situation.
That's well put. It sounds like you recognize how good the start of it felt, and that it became even more volatile and toxic as time went on. So there are things you miss and things you don't.
Are you continuing going to therapy?