My girlfriend just won't keep promises to me?

We've been dating for two years now and our relationship is going quite well. The only thing that really bothers me is that fact that she almost never keeps a promise. Now most of the time they aren't really important things but it still bothers me because, within the first month of our relationship she asked me to promise never to do things like say certain things jokingly or do some things that really bothered her, I tried really hard and after about a week I stopped altogether. Since then whenever something has bothered her, she’s asked me to not do it and I’ve really tried. I think that I’ve done a good job and have stopped doing all the things I said I would. Now I’m happy that she tells me when things bother her because I think that’s a healthy thing to do and I really don’t want to be doing anything that will upset her. The only problem is once I started asking the same thing of her I found out that it wasn’t really a two-way street. Some of the things that she’d ask me not to do I’d also ask her not to, and well I’ve stopped she keeps on doing it.

I’ve let if go until now because in the big picture the things haven’t really been that major however about a month ago I asked her to promise me she’d stop doing something that really bothers me and she said she would…however she’s just been doing it more and more and she’s told me the only reason she hasn’t done it more often it because she doesn’t want to deal with me being upset, not that fact that she promised. Then just today she said that she took back her promise cause it was being too much of a pain for her…what should I do? I really love her and there’s no question that I want to be with her it’s just that trust is a very important thing to me and I can’t stand that her promises mean nothing

My girlfriend just won't keep promises to me?
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