Sorry you find yourself here, but while your W is going through this there is no better place to be, so welcome.
Seems to me that you're more fortunate than most in that your W recognizes that she's having a MLC. This is a journey that she has to take through completion. Do not try to stop it or delay it as it will come back with a vengence at a later time if it gets interrupted. You can't fix this for her, she has to work through it from the inside out. It takes a while for them to get through the tunnel and for the fog to clear, and when you think they're coming out sometimes they'll run back in. The stages they go through are not clear cut and they can bounce around in them and be in more than one at a time. You will need patience like you never knew possible before.
An IC is an excellent idea, but again not a good idea to push it on her if she's not ready. If she's talking with you, listen and validate. If she starts projecting on you, validate, don't try to defend yourself (it won't do any good)and gives her justification in her mind to do whatever.
You getting in shape again is excellent. Take care of you. This isn't about you, but it affects you and being in good physical and mental health will help you deal with what's going on with your W.
Take this time to take your own journey. Look in the mirror and identify those things in which you need to work on for you. Make the necessary changes, and come out on the other side of this a better person, but do this for yourself. If you're doing it for your W the changes most likely won't stick and she'll see through them. An IC for yourself might be something you want to consider if you haven't.
GAL and detaching is for you. It helps shield you from W's drama.
As far as W showing feelings toward you and what you should do about it, I'll let the more experienced folks here address that. My H shows very little feelings toward me and lives with ow so I don't contend with that. They'll be along shortly to help you out.
You've come to the right place, these folks are the best for helping you navigate the rollercoaster ride.
Take care,
SA
Forgot to add that there are resources at the top of the MLC page which are an excellent source of information.
