You don't stick with one person till you die. It's has nothing to do with hate or love. I just see myself have a second wife and fathering another set children in the distant future. Jokes aside it's a real ambition of mine if I become quite successful. It's like having a retirement family.
LOL
Have you told your wife upfront or are you planning to gift her with this betrayal and headache after 20 years of love and loyalty?
If you have not been honest about being polygamous, you will end up an ex-wife and children who resent you. Your ex wife will likely remarry too, end up with real love this time.
This is why I tell women to stack their coins and have an exit plan at all times.