To avoid your personal property from becoming relationship property, and thus being at risk if your relationship doesn't last, you could consider entering into what is know as a "contracting out agreement". This type of agreement is often referred to as a "Pre-nup", although you do not have to be considering marriage to enter into one.
Contracting out agreements can record how you want your property to be split in the event of separation, rather than the default legal provisions. There are a number of ways that you can do so and it is best that you seek advice on your particular circumstances.
