@Lily346 So sorry you're going through this; you say it's exhausting and it must be.
From an outsider looking in, with only limited information, it seems like he is now trying to manipulate you into doing what he wants.
He wants his life to continue as it is; it suits him that way.
The way to achieve that is for you to terminate. He knows that you want this baby so in order to get you to terminate he is telling you (words only) that he will want a baby at some point and if you don't YOU are forcing HIM into something so he will abandon you.
He is trying to force you into a termination.
He is telling you what you want to hear in order to get what he wants.
That appears to be the reality.
What a peach.
Judge him on his actions not his words. He is not a good father to the child he has and he is putting you through this.
Him saying he will want a child at some point - after 10 years - is a tactic.
He has issued you an ultimatum; you don't do as he says or you are the person being difficult and he will punish you accordingly.
Assume he will keep his word and you'll not hear from him again because this will forever be about punishing you for taking the life that suited him for 10 years away and making it difficult.
Is this REALLY the man you want to stay with? Regardless of whether you keep this baby or not.
You are worth so much more than this.
Your friend knows you and your relationship better than us and is saying the same as most of us. We are all saying this is your choice not his - not 1 person is saying, on the information we have, he has a point or is advocating for him. Not 1.
You sound like you'd like to keep the baby so we're all saying only YOU get to make the choice that YOU have to live with for the rest of your life.
People terminate for lots of reasons - even when it's their choice I don't imagine many say it was an easy one but it is a whole other situation when you terminate and it's not your choice. You could feel resentful, hurt, angry, have regrets... you are potentially opening yourself up to a lot of feelings you won't be able to change.
Seriously consider how you are likely to feel.
You have said you have support; the NHS will have maternity leave and pay and then you can be upfront with them about your circumstances when you discuss your return; I think (could be wrong but you can contact citizen's advice for information) that companies need to flex where possible for returning mothers. I imagine the NHS to be a place where that can happen and you can work with them to make it work for you to return after mat leave.
He will also need to pay child support - this is something you can google/ contact citizen's advice about now while you're making your decision.
As you have been together for 10 years, if you have been paying into the house (mortgage, bills, renovations, etc.) then you may also have an 'interest' in the property and you could also look into if you have any rights as a common law partner in regards to any further support/ payment/s.
If you are low enough income you may be entitled to legal aid to support your claims, especially the 'family law' ones.
First stop: citizen's advice. Also ask them if they know of any free (pro bono) law clinics where you can speak with a solicitor.
Hertfordshire University have a law clinic with family clinic (maintenance/ custody/ financial settlement, etc) and property clinic (If you're not on the legal title of the property to see what you might be entitled to).
Other university's will also have law clinics and all the work is given or supervised by a qualified, registered, solicitor.
Gather the information you need so you can make an informed choice.
Sorry for the length but I just have so much empathy for you and want you to make this choice for yourself xx