Why would a man want to get married? They would lose their assets! As once married automatically assets are shared.
If a man is the higher income earner and has a partner who earns less but who does the household chores and cooks then effectively he is getting all that done for free.
All the wife work done for free is a huge bonus as that means if they split up then he doesn't have to give her a penny.
There are plenty of cases where a woman has lived with her partner for over 25 years as man and wife but without the legal document.
If something happened to him or if he found someone new she would get zero.
A man would only consider marrying a woman if he wanted to commit to her and any children they had, and that means financially and emotionally.
If he is not sure he wants to do that then you have to ask, why would a woman want to invest so much in a man who isn't so bothered/ wants to keep his options open?
Often it isn't that he doesn't want to get married, just that he doesn't want to or is unsure about marrying his present partner.
Men who highly value their partners never delay in proposing especially if they believe they have punched above their weight and feel lucky to have such a gorgeous partner.
Men don't ask women to marry them if they are handed everything on a plate without having to make any effort or if they are simply making do or biding their time in a lazy way until the woman of their dreams turns up.