After 22 yrs and 2 'children' - I left as it turned out- for 3 months last year.
The 'kids' 21/17 - who had encouraged me to do this over the years - refused to have anything to do with me- that really killed me.
OH and me talked a lot and resolved a lot of issues and are still together.
'getting out' I found , is not always the best solution, althoug at the time I thought it was.
As a post somewhere else said - the old adage ' the grass is always greener' is not true. A lot of people if they are honest will say that they love or care for their partner but are not 'in love' with them. Soulmates are a special thing.