How would you split bills / rent in this scenario?
Both of us have 1x child each from previous relationships, both late 30s. Fiancé earns £120k, I earn £28k. I currently get child benefit and UC top up, which will cease when we move in together. He has suggested we pay half the rent each, plus he covers all joint utility bills, meaning I still have all non 'joint' bills e.g. my mobile phone, my car payment. Due to this, I will probably be left with less that I currently have spare each month (which is already very little). The rent I pay will be the same as I pay currently, due to needing a bigger house to support both of our DC. I will be worse off some months, and others about the same financially because I cannot claim UC or child benefit. On more expensive months, for instance, the months when DC's school dinner fee is due, I will be worse off than I am now. He will be saving approx £2k per month in this scenario, which he has said will be put towards joint savings.
What do you think is reasonable for each person, how would you split finances?