That which makes a man "not propose" is quite easy. Usually it's either he doesn't love you, does not love you enough, doesn't love you that much YET, or would rather
ruin his future all by himself.

That which triggers a man "to propose" is another thing. It's more complex and I think it varies guy to guy.
Though the most popular reason is "
you're carrying his baby" .... which is a common practice.

Beyond that, I think it's more or less a combination of "finding a sense of fulfillment with you" and "not wanting to lose you". Lose you or Lose whatever it is that he loves. Ideally, which I'd still like to believe happens in a lot of cases, it's all about the realization of how much love he feels for the girl, how much he needs to sustain that which he feels, and of course the male-popular-trait of "
selfishness" which translate to him never wanting to lose the girl. Logically, there has to be a selfish element naman talaga for it to be believable, maybe even
reliable up to a certain extent.
Of course there are other reasons. Like sometimes it's not entirely out of love but out of
Need. Practically speaking, some guys look for the perfect or ideal mate based on who would probably make them better KINGS.

Which translates to a miserable time for the '
sucker' who usually was too young, to needy, or too dumb to see past all the glittering stuff the abuser blinded her with.

Do men marry out of boredom?
In fairness to that theory, I guess some men do. I guess some men feel that CHANGE is all about resetting your life and the easiest way around that is to find that partner who .... can shoulder most of the work, blame, and whatever it is you'd rather blame onto somebody else.

Of course as Health Gal mentioned two replies above, "
timing" is also an essential element. A man who is at the right stage in his life where his needs, his goals, and his opportunities all come together fluidly, is most likely to think "Future/Family/For the Long Haul .... Most rich successful dudes have mistresses on the side. So I need to get married first".
