Read this article in the NY Times. It details a number of stories of men whose wives, girlfriends and lovers who had cheated on them with another man. When this woman gave birth, the wrong father (usually the husband) signed the birth certificate claiming they were the father, and they were wrong. Now, these men have to pay child support to a child that aren't even theirs. That is tantamount to slavery according to this Boss, and Bosses aren't slaves.
If your woman doesn't want a paternity test, then you really need to consider ending your relationship with this person. After all, why should she feel nervous if there's nothing to hide? In the words of former US President Ronald Reagan, trust, but verify.
I broached the topic with my significant other in the event that a child is conceived, and while the idea is unnerving, a paternity test is
The peace of mind is worth the drama. Demand a paternity test, or hit the bricks..