Do you live the success of a 38-year-old, or a 32-year-old? If the former is the case, you've probably already maxed out career-wise and won't be able to offer much more to her in coming years. This in combination with your expendable income increasingly going towards drug regimes in desperate hope of not looking like shit will mean less money spend on her and her dream of kids.
She'll sue you for all you're worth, win because you lied to her, and end up banging Tyrone in your house, your bed and your bathroom.
Hell, the house dog probably wouldn't even want to recognize you anymore.