What to do about my relationship!?

Well I have been dating this girl now for about 1 1/12 years now and I'm completely confused. I love this girl so much and she says she loves me but I'm not sure if she is in love with me anymore. We are having arguments over and over about the same stuff and its really annoying. I try to sit and talk things out with her before they turn into an argument but she just gets frustrated and does not want to hear what i have to say. It seems like i always am expressing my love for her but she is just so blah. She says that she is not really a passionate person and she expresses her love in gifts but i feel if you love someone you would at least try to compromise to accommodate some of what they like. Its in the bedroom also. She always says she wants sex so bad from me but then when we are upstairs if i dont start its not going to happen or she gives what i see as a half hearted try because she said she is not a passionate person. I dont know what to do. I dont know if i should just leave but its so hard because i really love or should i just try to stay and tough it out and see if it changes.