You broke your own rule. You knew this would be the case and you still got w/ her. If you love her you will make the situation work, if you just need to bone every day, you`ll lose her. Take a little time to woo her more, get her to relax more and help w/ the kid. She doesn`t have as much time to relax and feel all lovey dovey because she is busy raising a child by herself. Solve you problem by stepping up to help and you`ll get what you want.