Thanks for your question. My name is Tony, I can assist with this.
The answer to your question is likely to be yes: although the courts do consider a variety of factors, this is likely to be the starting point should you later break up and seek divorce.
The idea is that the parties are left in an equal standing where possible, to ensure fairness, which as you say, could mean she gets half of everything. However, a court does not have to spilt things 50:50.
There is a useful summary of the guiding principles here: http://citywire.co.uk/money/divorce-who-gets-what-in-the-break-up/a420044/2
It's potentially possible to lessen the effect by using a pre-nuptual agreement, where you agree before you get married as to who gets what if you break up.
These are not automatically enforceable in English law, however, recent cases suggest the court is much more willing to consider them when working out what is fair on divorce.
Does this answer your question?