There's a chance you have more time than you think. Right now you have to look at the positives. She hasn't filed yet. The friendship appears to be somewhat intact and you may be able to build on it.
As an FYI, my W told me in February that her sister was done in 2 months, intimating that her expectation for us. It's been 4 months and we're still married. My W and I both spoke to attys in April and we're in the initial stages of drafting a settlement. (My W is probably frustrated by this)
After some time, you will finally be able to digest that knot in your stomach. You will start having better days. The hills on the emotional roller coaster will be less intense.
