Thank you for your quetsion
My name is ***** ***** I shall do my best to help you.
A three year relationship when you have your own property is not going to entitle you to a particularly large share of the matrimonial home and certainly not a share of other assets.
Changing the names on the house you own will not change the situation at all.
Please ask if you need further details
There is no action that you can take that will change the financial outcome of a divorce - other than remain married for many more years