Should I be jealous about this? What should I do. (short and easy question!!)?

well i got a few texts from my girlfriend today about how she went to see this celebrity. Earlier before she consistently told me how much she loves him and how cute he is. But today she said she kissed him on the cheek. I told her i didn't really like that fact and she said she didn't care because she loved him soo much. Should I be jealous or a little bothered by this? O.o