I think an additional piece to Eric's post: Letting go of her does not mean getting a girlfriend or dating or thinking the marriage is over. You are taking it in a new direction though. That's for sure.
Work on you and you alone. Let the thinking stop. It will just tire you out. And you will be so raw you won't be able to form coherent sentences. You won't sleep. You will become erratic. Crazy. That's normal, but it won't help. Don't be normal Bobby. Be different. Be...you. Let your light shine and let the world see you as you are. No more. No less.
Do it sooner and your marriage may be saved. Do it later, and you'll at least be saved. You will do it at some point however. I suggest you do it sooner. Stop pursuing. Stop guessing what she is thinking. Work on you. Focus on you. Figure out what it takes to get your confidence and self-esteem back. To tie it to only you. Start now. Don't analyze what she is thinking. Analyze what you want and what you need. Analyze what makes you happy. It's possible it isn't her, but more possible you got lost somewhere in the marriage.
Go find you Bobby. You'll like what you find when you're done making the needed repairs.
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."