I will try to make this as short as possible, but I want to make sure I give an unbiased account of what's going on:

My girlfriend and I have known each other for over 12 years now (we're friends too) and have dated off and on throughout that time for periods of 6 months to even a year. We always end up mutually ending the relationship, but a few years down the road we end up back together again. We really enjoy eachother's company and our personalities mesh very well which is why it usually works out for so long I'm guessing. Anyway, our sex life hit a little bump recently and we haven't done the deed for over a month now, and I could tell it was really bothering her. I was a little miffed at her lack of effort recently to make advances on me, to get me in the mood, so I just sort of stopped initiating things. I wanted to talk to her about it but I also wanted to wait for the appropriate time to do so...

That aside, one weekend I was exhausted from working on a construction project, so I suggested I spend the weekend to myself so I could just rest and relax; she could go out with her friends who she hadn't seen in a while etc. This threw her off the deep end, and she ended up ignoring me for a week before finally seeing me on a Sunday evening... and only Sunday evenings for the next couple of weeks. Things began to feel weird after that, as if she was pushing me away. I suspected she thought I had cheated on her that weekend to myself, as it wouldn't be the first time she's suspected that of me (and was wrong every time mind you). I attempted to ask her about everything, why she was so distant, why did she disappeared for a week, can we talk about it. It only ever ended up in defensive argument from her side and she never really answered anything. 5 days ago we argued again when she asked to go biking the following weekend, but failed to include the fact that I have to buy her a bike, a bike rack, a helmet, everything essentially. Normally I wouldn't mind but my money is tight as I lost my job recently and have a mortgage to pay, so I got kind of upset and tried to suggest she help out a bit here. Things escalated and we eventually brought back up the whole previous argument about her ignoring me for a week.

It ended with me telling her how I felt hurt when she did that, and her responding that she is ''her own person'' and essentially doesn't have to explain herself to me or anyone, then she hung up. Since then I haven't heard from her, and I'm not sure if I should call or not. I personally feel she owes me at least some answers if not an apology. I try very hard to make her happy, despite the stressful situation I'm experiencing in life right now. I'm also afraid that we both have so much stubborn pride that neither of us will call each other back because we both feel the other person is in the wrong. I'm worried we'll eventually just drift apart or something... how can I go about this in a mature way? I haven't always been the best at resolving heated situations...