Why Some Guys Never Grow Up Does your grown-up guy act like a teenager? Youre not alone. Heres why! Hey ladies! Is your guy a boy masquerading in a mans body? Does he throw temper tantrums like he lost his favorite blankey? Here are 3 reasons why! 1. He had an overbearing mom. "When guys are too coddled by their mothers as boys, they become whiny brats as they grow older," said The Average Guy. "And no woman wants to be with them because they still want mommy to take care of everything for them. Those are the guys they say have mommy issues." 2. He doesnt want to forget his college days. For your guy, college was a blast beer with the boys, throwing his stuff all over the floor and never really having to clean up after himself. Unfortunately, now he wants to keep the frat party going in his relationship with you. 3. Hes in no rush. In his mind, hes got a while to go before he actually HAS to grow up, so why start now? Also, men today can have "friends with benefits" relationships well into their 40s and 50s because the definition of what constitutes a relationship has changed.