Heartyzebra, I have read all your posts.
One thing that stands out glaringly from what you have said is your low self esteem. That is surprising, shocking even, for anyone but especially so for an educated women, a professor no less.
You are far from old. Women in their late forties are coming up to their best. Their best will last a few years too, make no mistake about it. They are confident, articulate, exude sex appeal and are generally good people with whom to keep.
The fact that you won't be having children is a plus. I doubt many men in the same age group who have had kids or a child would want any more, they'd be pleased to have a confident, successful partner and be proud of her. She would be a trophy!
However if you go around feeling inferior to the point of being banned from your home iover Christmas, you are not going to command the respect you deserve. That was outrageous.
I have to ask and please forgive me if you've said but I didn't notice, is your home his house that you moved into?
I did take note that you've only been with him for a year and are already living with him, everything obviously moved very quickly. I'm surprised at that because you're not 20 years old, most mature people would take a bit longer to make such a commitment, especially if they have had previous relationships that ended badly, even more so if one had dependent children.
Take a good, long at yourself, draw yourself up to your full height and tell yourself you're a woman of substance, because you are. Not being able to have children does not make you inferior in any way. There are plenty of single, career woman with no kids who are much admired and a chlldless person can do things, take advantage of opportunities, that a mother cannot.
Please make the most of the good things you have, ie 1. yourself 2. your career 3. your salary 4. your freedom, plus the other things in which you are involved.
You don't need a man to define you and this one definitely does nothing for your morale. You could have a really good man friend who valued you with whom you shared many good times. This one is no catch and his ex-wife is being quite ridiculous, horrible, but he allows her to get away with it. He wouldn't be prevented from seeing his children for a drunk driving offence for which he paid the price a few years back, as long as he is generally sober and careful now.
Try to see this (still fairly new), relationship as if you were looking at someone else's. Do you have friends and family who would give honest opinions, or is there someone who could be objective? You have to get real, Hearty.
Don't leave it too long. Tomorrow go out and buy some new clothes, maybe have a new hair style. Walk tall. Smile. The world is your oyster, you just have to realise it.
Good luck! New year, new start.