Have you ever dated someone and then started to be not attracted to them anymore?

i am just not attracted to my wife anymore at all but we have a lot of kids and i promised her i would never leave her again for the rest of my life but it seems like i've become totally repulsed by her. i don't like for her to touch me or kiss me and it feel really bad when we have any physical contact. I'm also dissecting everything she does and it gets on my nerves ,i mean the tone of her voice the way she eats, the way she sleeps, almost everything and that is unreasonable ..........you have any suggestions? have you ever been in this situation ? do you have an opinion you want to share (no matter how harsh)