You’ve only been together a year? Your kids should barely know him and it is far far too early to be talking about moving in together let alone buying somewhere together!
In the first 12-18 months biochemically speaking the rose tinted glasses are still welded in place!
You need to wait at least another year and he needs to compromise where he lives in favour of the dc you already have.
Anything else is in my opinion completely unacceptable.
What stage is your eldest at in school? Quite honestly as he already had problems at another school and he’s just settled into this one it’s totally unfair to unsettle him again.
The needs of your current children trump both him and any potential children.
And don’t go doing that thing of not being completely on top of contraception in hopes an “accidental” pregnancy forces any issues that too would be hugely unfair to your current dc. So belt and braces on that!
And a man who won’t live where is best for you and your dc because the houses aren’t to his “taste” is a bad bet as a father anyway imo as parents HAVE to compromise for dc all the time. It’s a petty and ridiculous reason for not living in your area.
“Out of interest, what’s this guy’s background and relationship history? How has he got to 40 with no children if he is so desperate to have them?” I was wondering this too
Plus talk of babies soon and moving in together quickly smacks of love bombing and future faking which I would be very wary of in a nearly 40 year old who’s never got around to having dc despite claiming to want them.
Whatever he’s told you I’d be verifying with others
And quite honestly imo a couple should be living as a family together at least 2 years before having more dc if there are stepchildren involved. Otherwise the older children can very much feel and even actually be pushed out.
“This man raises lots of red flags” I completely agree
“his family have told me about his exs” his they are naturally biased and will be basing their opinion on what he’s told them they’ll have barely heard his ex’s side of things.
Have you met his friends? Work colleagues?
You and your dc do seem extremely vulnerable which is all the more reason to be cautious and move slowly.