The really good thing is you've got the means to start a new life, living exactly how you want. If you can do me a favour, imagine this, you choosing a house/flat, you choosing the furniture and any extras like ornaments, if you buy somewhere you choose how to decorate it. You get home, shoes off and chill, you only have to cook for yourself, no audience. No undermining of you by anyone at all. Your free life to do as you wish.
Man/Woman makes no difference to me hunni, it's just him wanting his cake and eating it.
Just imagine the independence?
Imagine the freedom?
Imagine a life where you call the shots and your inheritance is spent on you. I doubt you were given it to spend on MIL. It's not your fault that he sat on his butt for 3 years.
You must feel like you're on Masterchef, having to cook to an audience. I can't imagine MIL is that old so why can't she do the cooking so it's ready for when you get in.
Another thing you've got a house, what you need is a home.
All his excuses for not conceiving are rubbish. No one knows health wise, what is waiting them. I'm sure you're more than capable of parenting yourself.
Make some plans, get some advice, keep it all quiet. Don't give him the chance to say ah no no no, I want to freeze your accounts so I know how much I should get.
When a friend split up with someone, there husband did it in full knowledge of when would be best, made excuses why he had to keep the money, he provoked her so it looked like her decision but he had been planning for it a long time.
Please protect yourself