Don't worry, if she fucks you, who gives a shit? You'll get fucked over like a little bitch for opening up and taking chances, fact of life, you just have to learn to deal with it. Just set your mind to that she is a nice person, that she has good reasons whenever things don't play into your hands and if you with certainty eventually find out it is not so, realize that the only one who have done something wrong is her, you have nothing to feel embarassed about because you have not even suspected her for being a bitch, your intentions and thoughts have been pure.

This will give your mind ease, and it will not give her signals that you are a jealous, suspicious maniac. Thats a real turnoff, especially when you don't even have a mutual committment(lol)

Just chill, have patience, don't be on her case all the time and definately don't ask her about why she didn't answer on MSN and shit like that, just don't(save it for marriage). Be a nice and pleasant guy, be comfortable if you know what I'm saying, and whenever an oppertunity opens up keep your head cool.

And to do this it helps to stop thinking about sex and masturbating, that just makes you anxious, afraid, embarassed and suspicious because it's not pure. You should act like you're in love, then you don't worry, you're brave, patient, benevolent, and you'll make enourmous sacrifices. Unleashing your sexual lust beforhand kills all that. It's ok when you're on the dancefloor, being an animal after it's prey, it's a whole different ballgame, you're there to get laid, not to make a committment(shit imo but people still do it). But in your case sexuality should not even be a part of your life at this point.

Just so you know in case you didn't.