I think you need to be careful not to let her cake eat. You don't want to fall into the friends role and you don't want her to think that you're still there waiting. Remember at some level she has to miss you to come back and the first step in that is realizing that she might actually lose you. I am not sure that initiating friendly exchanges helps to get that point across.
She cant "lose" you unless she does lose you. If she has an OM, you have every right to be done with her and you should.
It's like a girlfriend chose another guy over you, but will let you come over and change her oil or move furniture around and that OM only has to seduce her and have fun with her.
She knows you will be always around, but doesn't love you like that anymore.
Please do not wait on her crumbs. As long as their is an OM involve, you are not important enough to her.