Deardebra : Thank you for your question.
Deardebra : The reason why she decided to stay friends is she could not even imagine her life without you in it.
Deardebra : she wanted you in her life and she found a way by being friends. You both work together so she gets to see you and you never left her life.
Deardebra : it seems too me that she dies have strong feelings for you but might have been afraid to fully commit to the relationship out of fear of being hurt.
Deardebra : this is very common, some times people even go and date someone that they do not have strong feelings for so they do not have to worry about being hurt.
Deardebra : evey thing you have said is all signs of her thinking of you.
Deardebra : Congratulating you on an award was because she was proud if you. Birthday message was because she wanted to share in your special day and she wanted you to know that she was thinking of you.
Deardebra : She has really positive signs that she loves and cares for you. I would really give this friendship a try and see if it leads you both back together.
Deardebra : it just seems like something pulled her away from the relationship. It was like she felt she had to leave even knowing that she loves you.
Deardebra : I feel that you should try doing some of the things she does to show he you still care about her. I think she needs to know how you feel about her.
Deardebra : she is trying to show you how she feels.
Deardebra : but it seems she might be unsure on how you feel.
Deardebra : show her done signs that you still care about her.