It´s a situation that can be very uncomfortable sometimes, especially for the girl.
I will speak in general.
Isn´t because you don´t like someone who likes you, to try to avoid this person.
People don´t choose to fall in love.
They choose the one to fall in love too.
Love comes without invitation, with no reason, it has nothing to do with logic.
So there is no reason to avoid this person.
However, we can engage in a conversation to this one to let him/her know that you are sorry because the feeling isn´t reciprocal.
That´s it´s hard for you to say that but you prefer to tell the truth instead of doing what many men would do which it takes advantage of the situation.
Then you can offer your friendship. being a friend can help you know more about this one.
maybe you will develop some feelings for what you discovered or not.
Dialogue is the best solution in this case