Shall I stay or shall I finally go?

My wife has been unhappy (she claims) for a year and a half which has affected her intimacy, affection, respect, love towards me. We had sex a few times only throughout 2010.Every time she says she is unhappy it to do with her decor company which she works from home. To be honest I pay all the household bills, so whether her business is doing well or not isn’t major as this doesn’t pay the bills. To be honest the business is doing fine, and I help her on my weekends off, as I have a full time job. Her business would actually do better if she didn’t go out for alot of the day almost everyday and leaving the business phone at home. Also I brought her a small dog at Christmas 2009 and since then things have been even worse, all the attention goes on the dog and not me.I am extremely nice to her, loyal, and would do anything for her. But the way she has been has slowly been eating away at my happiness and love for her.I don’t bring up our issues often as she is a bad communicator. I have gained nothing from these serious conversations, for instance a month ago she said fine we will have sex that nite, when the evening came and we were in bed, I kissed her and she pushed me away and yet again said she not in the mood then went to sleep.The only thing that is really keeping me there is that I Iove her, we do get along sometimes and I find her attractive but that’s about it. I can write down a list of dislikes. lastnite had a serious conversation which she reluctantly agreed to. She got uneasy, frustrated etc. She said yes we will improve this and that, with no plan of action, soagreeing for the sake of it to more sex, more affection etc.  Plus there’s still no explanation as to why she has changed still!, I still don’t buy the fact that the business has stressed her out this much. I said if our relationship carries on like this then I will consider leaving because if been taking this for 2 long, she then said calmly, if your unhappy and you want to leave then leave...