Questions: Break Up & Divorce

This is the first serious relationship I had and it ended about a month ago. She had always been very nice and generous with me from the day we met in person (we live in different states). We never intended to date but one thing lead to another. Two months after that she broke up with me facing away from me and crying. We talked for three or so hours afterwards. She gave a variety of reasons, none of them directly blaming me and talked about how much she relied on me and cares about me since we've met.

She said she wanted to remain friends and I did too. She's been miserable the past few weeks on top of her depression Recently whenever I think of her I go through a cycle of happiness, sadness/bitterness, guilt for feeling that way for someone who did so much for me even as a friend, and weakness for not having better control of my emotions. I feel like I still owe her my friendship because she's done so much for me. Do I?