Well for the most part, if she has an unbroken hymen, she's a virgin, however this isn't always reliable because it can break because of sports, some women don't have one, and some women have broken it through masturbation. Furthermore, the hymen can be fixed through surgery (though it does not fix itself no matter how long a woman goes without sexual activity). That's pretty much the only indication you'll get though. You should just ask her though. If you can't trust her answer, then you have trust issues you need to work out, and if she doesn't want to tell you, then you need to find out why. A relationship is built on trust, if the two of you can't trust each other with such a small unimportant thing such as virginity, then you both need to stay out of relationships till you learn to trust others. You don't even have to trust anyone, just whomever you're in a relationship with. The world is a crazy place, where you can't trust anyone, except the ones you love. And relationships are build on trust.