I'm reading a book which is about how to maintain a good relationship with women. The book has a paragraph:
Do not change yourself for women. If you change your behavior drastically for them, they lose the attraction as it was another behavior they were attracted to initially. In the same way, if you met a woman because you were attracted enough to approach her, her best strategy to keep you is also to stay the same. The biggest difference is that she has little control over some parts of her body, such as the pace at which she ages, but you have lots of control over your behavior and can really ruin things in a matter of moments
What do "stay the same" and "in a matter of moments" mean in this following context? And why did the writer write "In the same way, if you met a woman because you were attracted enough to approach her, her best strategy to keep you is also to stay the same"? Thank!