Do I really care about her or am I in it just for ?

My girl and I have been going out under the radar for almost four months now, I love it, and she does too. We had a crazy past to say the least, but to put it short, I loved her while I was dating my previous girlfriend. We are our best friends and I sometimes wonder if I am just with her for . I know I have done this in the past, but this is the first instance I am worried about it. We have at least once a week and that is when she stays the night during he weekends after work. I believe she thinks our relationship is ually based. I do not want our relationship to be based that way, but I feel like it is as well. Nevertheless, I really love her and care about her more than anything in the world. When she does not want me to do something, I make sure I do not push it like how other guys do (at least from what I hear), but I do take many ual advances towards her when we are alone. Besides , we do other stuff too like participate in feeding the hungry, we go on random explorations, go the pool, save kittens, and hang out down town. So do you all think our relationship is based on sex or am I just horny and paranoid? Please give me some pointers :)