I can completely emphasise with as I was in a similar situation until recently.
Your kids are aged between 17 and 13 - which means that they're probably quite independent - and you both have more time and less stress at home.
4 years ago your homelife might have been busier and hectic when the kids were younger....It's a very similar scenario to mine! Our kids are now 15 and 11 (15 year old....Asd with a very long history of violence towards us, his parents) - and although it's a nightmare at times, it's much less stressful than it was a few years back.
I'm sorry to say this but it's very apparent to me that your wife is having an affair. She has checked out - and the only way she will try to check back in is if she is caught out - and then it will be through desperation not to disrupt your family. In my case my partner was trying to push me into leaving, that I'd finally just give up.
I'm about to post up my own thread about my situation but If I was you I'd try and confront your wife and sit down together to discuss where you are and where you both want to be!
My partner had been gaslighting me for years - when I look back she was also emotionally abusing me to an extreme level - as she carried out an affair for 5 years. (25 year relationship too.....did I post this when I was drunk last night, lol). She got a better position at work with a lot more money - and then her complete disregard towards me got worse...
The no sex thing when I tried to talk about it was just brushed off....'lots of people don't have sex' etc etc.....
We've