Please explain why do i stay

Let's look at the big picture here if we may. It doesn't sound like there is a major problem here, nothing that couldn't be resolved. For a marriage to work, both must keep working at it. For instance, you might want to talk to her about her flatulence and how you do not appreciate it. Tell her that it is very unbecoming and you don't feel it is acceptable to do standing near you. As far as her complaining, does she have a legitimate reason to complain or not and is it chronic? If it is chronic, then maybe she has an issue with you that doesn't get resolved and she is taking it out on you. Try finding out what her issue is and that might stop some of it. Talking out your differences in a calm manner can sometimes help and being a friend and confidante will strengthen the relationship. Usually when kind words are spoken it gets reciprocated. If you want your relationship to improve then try new ways to handle the situations. You say you love her, then why wouldn't you want to fix your problems? I don't know what your dream is but why can't you have it while you are still with this woman? And think long and hard before you think the gr is greener on the other side, that is you want to be on your own. It won't necessarily be a rose garden. So why do you stay with her? My guess is that you love her more than you think and the dream that you have may not be realistic. Hope things improve for the two of you.