What's one way to know a man is future faking vs when it's for real?

SallyF
Several men will say things women want to hear. They will even promise eternal love and a family but it's all a lie, part of their act in keeping her and then dumping her when she's useless; making her waste her youth. They are mainly narcissists and players that are future faking. They get another girlfriend, convince her to live together and tell her the same fake promises of marriage and a family.

On another side there are the serious men that really want a family and do as promise. My male cousin is one; he was just 23 when he got engaged. Now he's 31 (still married) and has two kids. He still does as promise, even on little things. Ex: If he said ''I'll be there at 5 pm''... he's right there knocking on your door by 4:50 pm; punctual on even time.

But honestly, how can a woman tell early on whether a boyfriend is a future faker or family oriented like my cousin? My cousin is also romantic (the future fakers are say romantic things too) so how to distinguish between them?
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How to tell between a liar that springs along women vs a real man that will settle down and does as promised.
What's one way to know a man is future faking vs when it's for real?
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