My girlfriend has been bumming me the fuck out

For the past month, maybe even more, i have just felt like my girlfriend has been ignoring me and it's making me feel like shit. She never makes an effort to do anything in our relationship, not once have i been asked if i wanted to go out for lunch on the weekend or been sent a nice message out of the blue, but i have many times. I just feel like all the effort i put into trying to be a good boyfriend isn't reciprocated and it is just weighing on me more and more everyday.