Welcome Shayne
People are human and in certain situations things can happen that wouldn't usually happen.
You kissed a girl. You didn't let it go any further than that one kiss. You knew that you had too much to lose to let anything more happen. You know that you love the girl you are with.
However, she knows that you kissed someone else and may worry that this could happen again and that, next time, you may not stop at one kiss.
She has forgiven you, but has not really come to terms with it.
You are only 18 ~ that is very young, and I'm guessing that your girlfriend is a similar age (~ and you have been together for nearly two years ~ that is a long time at your age). You need to realise that emotions run high when you are in your teens and cannot always be controlled.
In the same way that your emotions allowed you to get carried away enough to kiss another girl, her emotions may make her feel insecure and possibly a little jealous.
You do, however, sound like a mature couple. Do you want to try to work through this together, or would you be willing to see it come to an end? As Pudgie's Mum asked:
'Which would be more painful, to continue as is, or to break up?'You need to sit down with your girlfriend and talk this whole matter out ~ what happened, your current feelings and fears, etc, etc.
Good luck!
