A.M.
i don't see the issue. apparently you gave her the impression that you are having trouble in your marriage, that you are unhappy, etc. you even said you were TRYING not to tell her too much- which is unusual for you. so she was very honest and said she'd like to get together, but she doesn't know how things are with you two. what's the hangup? she didn't say, "if your marriage isn't perfect you're not invited." she doesn't want to invite you into an awkward situation if your marriage is on the rocks. sounds to me like she couldn't even really tell if you would enjoy being in the same room with him. a simple, "maybe it's not as bad as i made it seem, we're working on things, it's okay." would have been sufficient. don't overthink this. you have been friends for 20 years. why the suspicion and attempt to find hidden nefarious intent??
after reading your swh, it seems you are ignoring the common sense we are all advising and determined to see judgment where none of us feels there is any. i would suggest this is a sign of your anxiety issues - if you are seeing a counselor, talk to them. every single person here is saying this is a non-issue and you still want to take offense. you are choosing to make this a fight when it doesn't have to be. that is your choice. i'm always disappointed when someone comes here and "seemingly" asks advice...but already has their mind made up no matter how many people advise them otherwise. kind of a waste of our time and attempts to help, isn't it?
after your "new" SWH- i am done. you are twisting this and making excuses for yourself - that's not anxiety and depression. that's being self absorbed and stubborn. you are wrong in this situation. get over it. accept it. grow the hell up. it is not her fault, nor is it ours. sounds like you just like to create drama and then boohoo about how awful your life is. have fun with that. you are 40 years old with three children? yikes.
oh and PS (i'm sure you won't read this but i'm saying it anyway) not ONE person was unkind to you. PLEASE make good on your dramatic tantrum, and indeed, DON'T "put yourself out there" here again. that'd be great. thanks.