a lot of good advice in here. Going to try to keep this short.
Obviously the problem isn't brewing. It sounds like you're a younger guy in a new relationship. I'm not so old myself so i can relate to your social situation.
what i've come to understand is that the modern american woman is ridiculously insecure. They're raised to look for a knight in shining armor. In today's society that means someone who will cook,clean,work and give her the pants in the relationship. Basically, as a man, you're supposed to finish raising daddy's little girl for him. Since they don't know how to take care of themselves they act out and get insecure.
best way i've found to handle these is to not handle it. You want a husband or a dad? I'm no good? Find someone else. Nine times out of ten the neediness is to appease their lack of self esteem. If you start down that path and play the game she'll keep asking herself if you'll do another thing. Before you know she's cheating on you because you've let her push it that far. "if he can forgive me he really loves me." there's no end to that self serving, depressed state of mind.
Be the man in the relationship. Make the tough decisions. Even if it hurts.
wtf?