Does common law entitle my boyfriend to my investments?

My mother called me up recently all in a tizzy because she said that there's something called common law that would entitle my boyfriend to half of what I own in the event of a breakup regardless of our marital status because we live together. It sounds ridiculous to me, but is it true? We live in Illinois and have lived together for about one and a half years. Although we plan to marry eventually it's still not a done deal and I'm wondering if I need to put my investments in my mother's name as she says.

[I AM ALWAYS LIABLE]

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[This message has been edited by I AM ALWAYS LIABLE (edited October 14, 2000).]