Sorry you are here. Have you read DR and/or DB? If not, get them and read them.
Have you seen a family L? It sounds scary, but you need to find one and talk to them.
"Is it possible to gain trust back when they just don't want to?"
Yes, but that doesn't mean you will in your case. You can control you. Make you the best person you can be. Ditch the anger. Be happy by owning your own happiness.
W seems to be noticing your changes. Will this get the M back? No idea. But the books will tell you, if you are getting positive results, keep doing it. Stick with your thought of showing her, not telling her, about these changes. And these changes are for you. You'll have them regardless of the outcome.
me: 45 W:45 M 20 years T 22 years S14, S13, S11, D9 BD 2/28/14 D papers served 3/3/14 I moved out 3/15/14 MC start 4/2/14 I moved in 6/2/14 D suit withdrawn 6/30/14