If they broke up and now she wants to be your friend again that's a little messed up but if you are willing to forgive her then she should make most of the effort, you should also make it clear that she can't just abandon you again if she returns with her boyfriend. If she is still with him then maybe that means she finally took a stand and demanded being able to have you as a friend, it's still a little messed up but it's up to you if you think she deserves a chance, but the effort should be up to her.

Look, we all get it wrong sometimes and there are many, many of us who fall into the trap that your friend did. If she wants to rekindle the friendship and just as importantly, so do you, then you can't enter into this with anything but the willingness to forgive her. Yes, she was in the wrong but that is not something that can be changed. What's done is done. You mustn't punish her for her past mistake by insisting that she 'make it up to you' for however long you feel she should. It won't work and you mustn't hold this over her. Granted, you should both have a conversation about what happened but it must not be used as an opportunity to apportion blame. You must decide what you really want to do. If you want to be friends again then you have to do so freely and without obligation. That is not to say you should act like a doormat and pick up where you left off but out of the two of you, someone has to be grown-up about it and act in a mature fashion. And, that falls to you. If it is to work then you must let go of any resentful feelings you harbour towards her, draw a line under the past and start afresh with a clean slate. You can forgive the past without forgetting it. And you forgive not for her sake, but for your own, to allow yourself to move on. She was your friend, she fucked-up & she will be just as aware of that as you are. She has had to swallow her pride in order to get back in touch with you and if you really wish to revisit this relationship, then recognize this and behave accordingly. You don't have to be a fool or allow her to treat in such a fashion ever again but this does not mean you cannot become friends. It will take time as the friendship will have to start from scratch and trust between you must be rebuilt. This can only be successful if both partners are equal, making equal effort. You can, if you wish, decline her offer and this will be a reasonable decision on your part. But, if you accept the hand of friendship, then you must begin on a level playing field and build on it from there. The difference this time is that you enter into it with your eyes wide open and the knowledge of past behavior. This alone will provide you with protection from being hurt again. Know that the past may repeat itself and if it should, then you will walk away, straight away. She cannot hurt you again if you don't allow her to do so. So, give it a go if you really want to because there is nothing to lose and you are not being a fool for doing so. But do it with an open heart and a willingness of spirit.

first of all I suggest that you have a heart to heart talk with her and spill it all, how you felt and how you feel now. no games. talk it through until resolved on both sides. that's what mature people do. I don't think she should have to make most of the effort. that sounds rather childish and punishing. friendship requires a sense of equality and respect.

don't give her a second chance If she did it that easily you shouldn't just take her back that would make you a weak person Or at least make her make all of the effort If she really wants to be your friend she will try