Most Helpful Girl
Doesn't sound like much of a girlfriend, I'd dump her and start dating other people. People that want to see you, and can give you a more concrete answer than 'I don't know'. She doesn't have to say yes every time you want to hang out, but out of respect for you, as her man, she should give you a definite answer and stick to plans when she makes them with you. Gradually this builds too, I'm engaged so he knows what I'm doing most the time. Somedays we'll go a whole day without speaking, but will always exchange sentiments at night before going to be sleep (we don't live together right now). I find it my responsibility to let him know what I'm up to.