Thanks for your question.
If if going to be a long engagement then you should consider making a cohabitation agreement with your partner, this is a deed signed by both parties which states whether or not each party is to have/accrue an interest in the house. It will also deal with other things such as property bought during the course of the cohabitation, debts, budgeting and payment of outgoings.In order for it maximum likelihood of standing up in court you should both take independent legal advice on the document and be completely honest with each other about what you both earn.
In the event that you marry things become slightly more complicated in that once you have been married for a significant period of time there is a presumption that the matrimonial asset pool will be divided equally (50/50) upon divorce. This presumption can be rebutted where there are children for which one of you will have residence and be the primary carer or in cases where one of you requires higher income because of ill health (there are other circumstances). You can enter a pre-nuptial agreement but while these agreements have recently had more weight attached to them in the past by the Courts it is still very far from guaranteed that the Court will split the matrimonial asset pool according to the pre-nup.
I'm afraid exposing your assets is ultimately part of the marriage package.
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