She says that she wants to be with you, and you still love her.
If both of you feel like this, then maybe it's worth giving the relationship another chance. what do you think?
But, if you do, you will need to put concerns about the kiss behind you.
If you are worried that she will go off with other boys, then you are not going to be happy, so maybe you need to really talk this out. She may be concerned about doing this, but, if you explain that you need to put it in the past and get closure, so that you can move on, then she may feel that it is a good idea.
The truth is that some girls & boys kiss others because they are looking for fun elsewhere and they may continue to stray ~ but there are also girls & boys, who will just find themselves kissing someone, without ever intending it to happen and without ever intending for it to happen again.
People are human, with human failings. No-one is perfect.
Have a think about what you want and what you can do about it.