I agree with JoysMum
It's not just deciding whether you are ready to be a mum, but whether you are ready willing and able to be SiNGLE mum, because that's almost certainly what you will be. You can't make him want this child. If the romantic vision of the three of you as a happy little family is what you are hankering for then put that out of your mind, because it ain't happening.
But if you feel in your gut that you want this child so much that you are prepared to go it alone FROM DAY 1, then have the baby and good luck to you. But back out of the agreement on the house now, because the relationship is going nowhere. Even if he relents in the short term he will be doing it under duress and I think he will bail later in the pregnancy or very early on in the child's life. It would be much less difficult and less painful in the long run to start the whole journey alone, because you will almost certainly finish it alone.
If that idea terrifies you then it's better to have a termination. But whatever you do don't have one under duress in order to keep him you will never forgive him or yourself and the relationship will be blighted forever because of it. If you have a termination do it because you don't want to be a single mum.
If you do go ahead with the PG and later down the line once the shock and fear has worn off he decides he does want to be a family with you and the baby after all, then it's up to you to decide whether to let him back in to your life or not, and whether you can trust him.
I am a bit surprised to hear that you've put down a deposit on a house together so soon into the relationship. At 35 I would have thought that to do that he must be head over heels and thinking you are 'the one' and he's ready to settle down, in which case while the unplanned PG is less than ideal, I would have expected him to be much more accepting and a tiny bit delighted.
Personally that would make me question how much he really loved me and how committed he really was, or I'd be wondering if he's a total control freak who can't cope with anything happening out of his pre-planned sequence, in which case he'll be quite challenging to spend your life with. After only 7 months you are only just getting to see the real him and how he reacts under stress or when he doesn't get his own way, and it isn't pretty is it?