What is the proper way to address a wedding invitation?

My fiance and I have been living together for a year now. We just received a wedding invitation from his cousin. His whole family knows me and in fact this cousin drew my name in the gift exchange for Christmas so she obviously knows I exist. The invitation came addressed to my fiance and guest. "and... show more My fiance and I have been living together for a year now. We just received a wedding invitation from his cousin. His whole family knows me and in fact this cousin drew my name in the gift exchange for Christmas so she obviously knows I exist. The invitation came addressed to my fiance and guest.

"and guest"????? are they expecting him to take someone else? Am I being overly sensitive or are they treating me as if I am invisible???
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