How do I convince my girl I haven't cheated?

Help Me.. The girl I'm in love with and never want to be without thinks I have cheated!!
Basically I went on a guys holiday with my best friend and came back with a love bite on my neck, now I know how it looks but it was completely innocent, it was done by a drunk girl who I used to know. I thought she wanted a quick hug and kiss to say hi, turned out she was a vampire. as soon as I realized what she was doing I pushed her away. unfortunately she marked me. I keep getting angry with her as I can't convince her otherwise and this makes the situation worse.
I'm in danger of losing the best thing to happen to me... advise needed big time.
Jon_Boy

My advice to you is to sit her down and tell her how you feel. Tell her what you just said, that you can't live without her and she's the best thing that ever happen to you. If you didn't already tell her exactly what happen. If there was something there that witness that and can vouch for you then tell them talk to her. Of course she still might not believe you cause they are friends. If she still doesn't believe you, the best thing you can do is give her time to trust you again, if its meant to be then you have nothing to worried about.

u must tell your girlfriend evrything from beging to middle to end . get your friends to tell her anything explain to her as much as you can if you have 2 cry in front of her to tell her how much you are sorry and that you didnt do it . then cry . tell her she deserves to be mad but not mad at something you never did just expalin it to her and im sure she will understand . and rember choclate ,ballons, roses, and a love you from you to her after you guys make up.!
r
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If there is anyway of convincing your girlfriend to speak to this girl that bit your neck so she can clarify that it was just a drunken mistake, nothing happened and she doesnt want you that way, it will make your girlfriend feel a lot better.