Uhm I think the problem is that your internal system is working just peachy but you want to ignore it.

Just because a guy looks great on paper doesn't mean he's great for YOU!

Your body is reacting violently because it is telling you that this is not what you want. Did you suddenly decide that you want marriage and kids and the whole shebang? No, I didn't think so. People don't go from wanting a free spirited unattached life to being tethered down overnight.

Honestly, I hate the concept of the "perfect guy". IMHO it was invented by the woman who wants a VERY typical/antiquated life including the dream wedding, 2.5 kids, and the marriage to prince charming himself. And then, if we come across this guy who looks spotless on paper but somehow it just doesn't feel right, we feel like there is something wrong with ourselves. "I MUST be crazy to give up such a great catch!" Yeah, and the self-blame just continues to spiral from there.

The truth is that this guy may be a great guy, but if your fundamental wants in life are this different, its time to walk away. If he doesn't get kids/marriage, he will grow resentful. If you give in and give him kids/marriage, you will be the one growing resentful. In the end, life partners should have similar wants and goals when it comes to the major things. Otherwise it just isn't meant to be.