She's referring to the fact that your child's existence should be the main concern here. As many have observed, you are putting yourself in a precarious situation with your own supervisors (if they were to find out you are dating a higher-up at your place of business). Even though you feel that you have 100% job security, you still don't know what kind of personal/business relations this man has at work. As you said, you don't work directly for him.
The very fact that you are asking for advice about this situation shows that you are not secure in the decisions you've made. And yet, when we advise you to rethink those decisions, and be careful with future ones, you are the first one to tell us all that we're being ridiculous and overanalyzing the situation.
I'm sure you're enjoying the attention. Are you hoping to build something with this guy?