Should I be a stepmother or not?

So I was dating this boy for over a year. A month before I left for college he broke up with me because he said he wanted to "mingle" with other people. A week later he's in a relationship with his friend's sister. Me being as heart broken as I was, stopped all contact between us. Two month after we broke up, he calls me out the blue. He asked how i was doing and seemed real interested. More then he was when we were a couple. He kept the conversation on a strictly friendly bases. He ended the call asking if we could hang when i come in town. When I came in town for Thanksgiving, we met. He gave me a hug but kept everything friendly. He brought up he was single. He kissed me, and I was in love all over again. By Christmas we weren't on a friendly bases anymore. In a nut shell we eventually started talking about getting back together and so forth. Then before I came back for the summer, I found out he has a baby on the way. He was my first and the only person I love. I've finally moved on but i'd hate to think I'm wrong. Am I wrong for moving on? Should I move on?