That should be achilas peros and nichsay milug**
In secular law, a marriage is an equal partnership and thus when it is disbanded, an equal split is appropriate. In halacha, that is most certainly not the case. The same way a woman was supported by her husband (or at least he was obligated to do so) she can be supported again by her next husband. Why should she get half or even anything when halacha does not entitle her to it?