the allure is i really want to feel like a man again...to feel attractive to someone etc
Better to be a man than to try and feel like one. Aren't you upset that your wife is acting on her feelings instead of values, beliefs, and thinking? It sounds like you are in a innapropiate relationship if you had a young woman proposition you. I won't validate that as healthy for anyone in your sitch. I understand you are hurting, it's your job to take care of yourself in healthy ways. Trust is a very rare and valuable resource be wise before you trade some of it for a fleeting feeling.
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.