OP, you are misunderstanding the "nurse with a purse" comment.
A nurse with a purse is a woman who is financially independent of a man but provides all the comforts and caring of a wife for free.
A man who is not divorced, comfortably off, loves the comforts of being with you and would like to move in with you or live together, with no financial commitment, whilst you slot into a caring role, making his life more comfortable, is a perfect example of such a man.
Its a real thing.
I am 60 and I cannot tell you the amount of single friends and widows who have had these approaches from men they might be only seeing casually for 6 months.
Nice men that they really enjoy going out with, but who are now very keen to formalise a relationship where they will live together, cover their own costs, but undoubtedly the women will be providing home comforts.
NONE of these women I know want to share their home or be on the clock of a full-time relationship.
They love their own home, they love the independence of deciding if and when they will have company.
They love that they have no responsibility for the cleaning, cooking, laundry tasks of anyone else.
A couple let the relationship go rather than entertain it, a few others remain in their "together but apart" relationships, making it clear that they will never share their home with anyone again.
They all have small easy to manage properties and love the privacy of their own homes.
One such friend was enjoying such a relationship with a nice man that she met through golf and they saw each other a couple of times a week, whilst strictly not living together.
He had two grown up daughters with their own young families that made it clear they had no wish to have any contact or to even meet her.
She was fine with that.
Until he had a sudden health situation that was life changing, and she was contacted by his elder daughter to take over his various health appointments and caring duties when he was leaving hospital!
Suddenly she was keen to meet.
She was fond of him but that was not their relationship. She had an extended trip already planned to see family in Australia and made it crystal clear to his daughter that she clearly misunderstood the nature of their relationship and she was not going to be in any way involved in his care.
She ended the relationship with a clear conscience, as she knew that if the situation was reversed she wouldn't have seen him for dust.
Be very clear on your boundaries because it sounds as if you allowed yourself to be seriously used in your marriage and might still be very vulnerable.