I really have no option but to be a punching bag for everyone to express how they feel
You must be feeling totally overwhelmed, so slow down ... take some deep breaths ... & start to unpick this mess.
First up - your fiancee hates your family.
This seems like quite the turnaround, to suddenly decide to hate, over a stupid but common bloody wedding spat which YOU have now fixed, as much as it can be fixed.
Is your family hateable?
Do YOU hate them?
If you don't hate them, WTF is your fiancee playing at - hating on them? Making your life a misery? Forcing you to play piggy in the middle?
OK this DreamWeddingTM.
As a PP observed, it was a bloody daft idea to stage a destination wedding with a no kids rule when all your siblings have small kids.
Which begs the question - was this genuinely our dream - or your fiancee's?
Now my wife to be feels my mum has ruined the best moment/time of her life, and she will never get this back, something she has always dreamed of
There's your hint OP. Something SHE has always dreamed of.
She sounds a bit ridiculous with her claims that your mum has ruined the best moment/time of her life. Is she always such a dramatic princess, or can you chalk that up to bridezilla madness?
Also - is she always this insulting? She is prizing HerDreamWeddingTM over - you know, just the small business of an actual marriage. To you.
She is telling you that she believes HER wedding is the pinnacle of your relationship, & the marriage won't be the best time of her life.
My partner now hates me speaking to my family, wants to know every conversation I have with them even if it’s on the phone I have to explain what was said.
Then your fiancee is a controlling arsehole who thrives on melodrama & doesn't care how much she hurts you in order to get her fix.
She said she doesn’t want my mum to be allowed to talk about the wedding to me also
Playing Divide & Conquer games at your expense is SUCH a selfless act of love innit.
does my partner need to calm down and realise I could lose all my family over this
Er - yeah. But she won't because she doesn't care.
She is making you play the Pick-Me dance between her & YOUR OWN FAMILY.
If you can't see how cruel & toxic that is there is no helping you.
Can you not fathom her bottom line? She actively WANTS you falling out with your family. She wants you to lose them, & pick her. She doesn't care how much pain that causes you, or them so long as she "wins".
And you are her prize.
You should be feeling very nervous about that.
and work together to sort it, or do my family need to back off and realise they have ruined everything and give us space for now.
Your family haven;t ruined a thing. Stop buying your fiancee's poisonously concocted narrative. Fiancee's MyDreamWeddingTM was logistically - & probably financially - unfeasible for them, & they said so. Good for them for speaking up.
Its gotten to a really low point and I have no idea what to do as I am now stuck in the middle
Of course you are feeling low. You are stressed, miserable, & attempting the impossible task of taking responsibility for your fiancee's unreasonable demands.
What I would do is 'postpone' the wedding.
Tell fiancee that as you can't deliver HerDream you are calling a halt while you work everything out.
Then scarper to your family & take a few days away from that insanely controlling & unpleasant woman, so that you can think straight.
With luck you'll reach the right conclusion - that if you marry this woman, the rest of your life will be like this. After the wedding - DREAM or not - she will find something else to concoct melodrama from. Soon, she will decide that YOU are the baddie, & she will treat you like she treats your family.
Your family must be going bonkers with worry about what you are getting yourself into. Stop demonising them for being normal, & start listening to their concerns.