Rude aunt

Went to my bf for dinner two nights ago. His aunt comes in amd hugs everyone else and says hi but me. I have met her tons of times and shes always so rude. But never has not said hi to ackonwledge me. I probably should have just went up and all but i figured she would come up to me. Its not like i am rude or anything i just don't get it. *sorry about spelling mistakes!!!