What to expect?

Hi all! I am new here and it seems that this is a pretty cool website. Anyway, my question basically is how can I know if my girlfriend really loves me? I honestly have doubts because whenever I ask her to go out I feel that she finds excuses to not see me (e.g. I asked her yesterday to meet up @ the movies and she told me:“I don’t know, I need to finished up my studio blah blah. So yeah, what do you think? Thanks!

p.s we normally meet twice a month and we have been dating for the past 3 months or so.