The only real help you need to make it clear, solid, boundaries and being hard-core about what you want and need. People respond to that. Being an emotional chameleon, "trying" to be detached doesn't work. Set boundaries, set ultimatums. This is hard, but, it helps avoid all the back and forth. Does she want to be married to you or not? Thus far she said she wants a separation or a divorce. Act on that. If you want something else, state it. You can say, "If you want to work on this marriage, fine, if you don't, I have some decisions to make in the next few weeks." Strength and clarity are attractive.
The longer this drags on, the weaker your position becomes. You will compromise, make yourself smaller, meet her needs and then she'll walk all over you. Don't wait for her to act. Time to take control back.
In my experience, unless you are a complete jerk, changing yourself, becoming your "best" self, doing 180's don't really last. Eventually you will revert to who you basically are. I've seen it on these boards before - intense personal change that lasts for 12, 18 or 24 mos and then you slip back. Sorry to say this, but it's inevitable. The divorce gets busted and then, 2 yrs later they are back on the boards and the marriage is toast. Personal change is super hard. If you're wife doesn't like who you are, might as well end it sooner than later. Again, if you're a real jerk and need serious help, get it. If you're just a normal guy, you aren't going to turn into superman. You can't save this marriage alone. Two people need to compromise and work at it. You will hear in the forums that 180's and being solution oriented are really just emergency measures to get their attention. GAL is for your own sanity. The real hard work of repairing a marriage is 50/50 and In the end, she has to want the marriage as much as you do.
^Wise words from LH. I'd re-read this a few times and really ponder it if I were you.