He has diagnosed anxiety. Imagine how much worse it's going to get when there's a screaming baby. A tantrumming toddler. And when he's in his fifties - the adolescent dramas? It's going to be bad.
He's told you he's terrified, and has been doing so for quite a while.
I think you maybe haven't listened, or just haven't heard under the din of the ticking clock.
But yes, he's also future faking. The tests and the maybe baby are him playing for time. Putting it off, quieting the clock. For now.
There are two things in play here.
Either he doesn't want and never will truly want to be a father.
Or he doesn't want children ... with you.
This may be one of those cases where you split up soon - and the next thing you hear, he's married with a child.
Or in five - ten years time you're in the throes of peri menopause plus grief over the children who never were, he can't stand it any longer, leaves you for a younger woman and boom ... baby.
You might get pregnant and to hell with the consequences - a resentful, anxious and inadequate father of an unwanted child.
Or the fairy sprinkles magic dust and he transforms into a besotted ideal dad (plus bonus proposal.) Unlikely.
Or you get pregnant, and split up and go it alone. Could you? You've left your job and sold your home. I hope you have a good job and pension and savings.
Don't think about the sunk costs already invested in this relationship. Consider - so what do you WANT? Tick tock.
Him as your partner for life?
Or children?
Unfortunately, both are not an option with this man.