You can always get tested. If she informed you in writing that about the herpes "welcome", you could take that to the department of health and give them her information. She's maliciously spreading an incurable virus to the public. That's illegal in many states.
Now you know what's out there. Evil people who want to bring other people into their miserable lives. Look at it this way, it could have been worse. She could have said, welcome to the wonderful world of HIV/AIDS.
We were warned against the sin of pursuing the call of our carnal nature for a reason. When God tells us not to do something, being he's omniscient, it's a pretty good bet he knows what he's talking about.
Get tested!
You owe it to your future to find out if this cost you the rest of your life, or if she's not only what she is, but is also a liar who likes to emotionally abuse people by lying about having herpes. Feel sorry for that guy she slept with too. If she is infected, he's you.
Remember, if a woman is easy to get into bed when you're with her, she's easy. It's not that you're special, it's that she's loose. And she's bringing every man she's ever been with into bed with you. Where do you think she got herpes from? (if she has it)
Get checked! In fact, it is a very good idea to get a full panel STD screen done. She could have anything and everything.
You're in my prayers. As is she. Think how empty she is inside that she takes joy in doing this to her self.