Having read through all this post I hesitated before replying because I didn't want to highjack . I'm further along this path and it isn't easy .
My husband started a new job on first day of lockdown . I was stay at home mum with our two young children . He worked long hours on teams while I home schooled , helped my elderly parents and everything else . I remember it as emotional but I coped . My husband was terrified of losing our only income and this job , which was a dream job with some opportunities to travel became a sat at makeshift desk in front room at home all the time desk .
Thinking back to when we met it had all the negatives that have been mentioned . He was 19 but had left home at 17 and moved away . We became friends before we started a relationship . I was 28 with my own home , career and a decade of fun behind me .
When we got together him 21 me 32 we talked about the family we wanted and for 7 years we travelled together , he partied and holidayed with friends his own age , I was more career driven and he was free to do what he wanted . At age 41 our first darling daughter was born . She was planned and he became a father aged 28 . He was brilliant and our next child was born in 2014 . His career took off , I reduced my hours to become main parent while he sometimes worked away . I gave up work then lockdown . So full circle ( sorry about so much detail )
I was in a similar situation, my husband earning good money started to "treat " himself 2 years ago . Expensive clothes , extended active holidays for himself . While I couldn't join him because of young children and a back problem .
I asked him if he wanted a divorce , he said no , but he does want "adventure"
He pays all the bills , I have an allowance and the children don't go without . Yes I have the grind of parenting but when he's home he is fair and a good parent .
It rocked our marriage for a time but I can see he is tiring already of these adventures as he is not a young man ( he is 41 ) but not old either .
He is currently in Brazil and texting that he misses us and doesn't like it much . It's too hot and not safe .
We talked when his "midlife" crisis hit about what we both needed . I needed financial security for me and children and a father / husband I trusted . He needed a change of scenery sometimes
He was never wanting sexual experiences with others that's for sure . I wouldn't accept that
My point is tell him not to be unfair to children or cruel to you
Does he want to separate?
Let him go , it's up to you if you want him back
It's horrible when this happens but it can be worked through if you both communicate and are fair ( and not a t**t )
Hope you find a solution