Newsflash: Buying house with partner

We are considering with my long term partner to buy a place together, we are planning to get married next year. Currently, I was thinking to buy a place myself since my income is more stable, for now. In that case I would be the sole owner.My partner has good liquidity though and could help with down payment. If the down payment he can contribute is 10% of the purchase price would it make sense to own 10% of the house? I would be getting a mortgage for 50% of the house price and use the rest for the down payment. Will be repaying the mortgage in 5 years.