The unspoken rule is.... women tend to date up. Meaning, men whose perceived status is higher than theirs. Or at least equal.

Often this comes down to money or financial potential, confidence and substance.

You have to size up the girl that you're aiming for and figure out where you are in relation to her, unless you're lucky enough find her willing to date down (and even then you must watch out for signs later on that indicate that she has started to feel she had compromised her worth settling for a guy with a lower perceived status like you).

Beware of women who develop an inflated sense of self-value (i.e. narcissists & gold diggers) in order to get the high status men they want, unless you have the time, energy and resources to deal with her lopsided sense of demands vs rewards.

The point is to have enough potential financially to be able to enjoy a relationship and have a future with her. Don't be a broke ass dude.

True she might still jump to the next guy with a better job - if she decides to monkey-branch or be a gold digger, there's nothing in the world that you can do about it. You'll gain nothing focusing too much on things that are outside your control, it's always better to focus on what's within your control so that you can have contingency plans. In this case, if you're financially OK then you can always attract another and learn to size her up better. Any loss you experience can therefore be mitigated.

Bear in mind that's just one aspect of you. There are the other stuff about yourself that you can invest in building up. If you have a good package overall, then it's always easier to find someone.

You have to keep building yourself up. Don't ever stop. Investing in yourself never goes to waste coz it'll keep paying dividends one way or another.