What are the chances?

About a year ago I began seeing a woman. It was a casual relationship at first. I was somewhat recently divorced and admittedly a bit gun shy about being in a relationship, but wasn't opposed to spending time with someone and seeing where it lead. Her situation was a bit more unconventional. She was 3 months pregnant. The result of a one night stand that happened on a trip to the other side of the country. I wasn't opposed to her situation and really didn't think anything would come of it anyway.
As it turned out, the two of us really enjoyed spending time together. We became close, much closer than either of us had thought possible. She would always tell me that she knew the situation wasn't ideal and I had the freedom to get out or see others, but as crazy as it seemed, I didn't want to. I loved spending time with this girl despite her situation. As things progressed we became somewhat of a couple without ever really labeling ourselves. We would travel together, go to friends houses, dinners etc. It really became the most fulfilling relationship I had ever experienced and she felt the same. Life was good! I saw her through the pregnancy and She gave birth to a beautiful baby.
So wheres the problem......About a month before the baby was born, the father relocated to be with his child. Since he had to leave his job he had no money and she agreed to let him live with her in a separate part of the house. There would always be someone there to take care of the baby while she worked.
As soon as he came she would tell me how frustrating it was to have him there. He was someone she hadn't wanted to see again and was annoying and a nuisance. I would tell her that at least he isn't a deadbeat and was there to support his child however he could. I am now eating my words.
A couple months passed and she began to accept him. Unfortunately she accepted him too much and they slept together. She came to me immediately and told me what happened and how horrible they both felt. I was a bit taken aback and hurt but since we never officially labeled ourselves as a couple and she always told me I was free to see others I felt maybe she should have the same opportunity. None the less I was hurt and skeptical from then on, but we went forward. Still seeing each other and spending happy times together.
a couple months ago she again came to me and told me she was starting to develop feelings for this guy. They lived together and she felt it was a natural progression but she was torn and confused because in the time we had spent together she was in love with me. I did some soul searching myself, and knew that I was in love with her as well.
She made the decision to give the father a fair chance at a relationship for the baby's sake. That with all she had on her plate, working and a new baby the conventional thing would be to be with the father of her child. but she still loved me and still had hopes for us. I was devastated. I was truly in love with this woman. Its been 2 months since Ive seen her and I miss her every day. I hear from her from time to time saying she has been thinking of me and that she misses me, and I do her.
I know this is probably not a common situation, but What are your thoughts? What are the chances her relationship wont work out or even if it didn't what are the chances she would come back to me?