At 21, being “very mature” for your age makes you less likely to end up on the Internet, naked and compromised, so corporate recruiters can lean across the table on job fair day and whisper, “So, tell me...were you in business school on a gymnastics scholarship?”
A few years back, you probably just missed taking a married, middle-aged dad to prom. Even if you were “mature” for your age, at 17 your greatest accomplishment is something like getting a handle on your pimples. Ask yourself what man in his 40s finds a 17-year-old girl his peer, his partner, his equal? Probably one who knows better than to hit on all-growed-up women who’d be quick to notice he doesn’t just have baggage, but a caravan of broken-down U-Hauls. Think about it: You’re planning to marry and have children with a guy who’s not only still married to somebody else, but supporting three other adults. And you’re seriously expecting this to change? Okay, it could — should an asteroid flatten all of them.
Here you are in your early 20s, the peak of your hotitude, the time to date around and see what’s out there, and you’ve taken yourself off the market for this guy? You actually have no business doing anything of a permanent nature in your early 20s. These years should be renamed The Idiot Years (a follow-up to the teen years, the Wildly Moronic Years). Recent research by child and adolescent psychiatrist Jay N. Giedd suggests the prefrontal cortex, the judgement department of the brain, is still developing through the early-to-mid 20s. While individuals do vary, you most likely got together with this guy before you were fully brained, and certainly before you had the life experience to know who to let into your world and who to send back to his wife.
Be honest: You know this guy is a bad bargain — a married liar and one-man welfare state who’s bailing out everybody but General Motors. But, because you got attached (perhaps both to the guy and to the guy paying your rent) you’re working very hard to tell yourself love is all you need. Be sure to tell that to your kid when he has a toothache and you can’t afford the dentist, or when you’re consoling him after he wets the refrigerator box (he’ll have a bed to wet just as soon as Daddy finishes paying off his sister’s new kitchen).