Tempted and confused

I've been married for quite a few years and have a child. My wife has a low sex drive and we have often had issues with that. Our sex life is almost non existent. Now completely unexpectedly a much younger woman has made it very clear she would like to provide that physical relationship. I care about both and don't want to hurt anyone especially my child but ive always wanted this physical relationship being offered. Do I try to bring it up with my wife and see if she would either work on our relationship or allow this other one. Should I ask the younger woman to back off and stay in my situation or should I have the relationship and not say anything?

Talk to your wife. Really if it as bad as you say you should have done so a long time ago. Having a partner who has a low sex drive I very challenging but it is fixable. Trust me I've seen people in your situation choose the sexual relationship and I've yet to see one turn out good. Just tell her EVERYTHING and you should be fine, Good luck