heart break from the past

Dated a guy for six years. It was the most passionate relationship. Due to immaturity on both our parts  and my family not accepting him we broke up. It took me a long time to realize how broken I am after breaking up. I recently found out he and his new girlfriend are having a baby. It really just brought on a lot of heart ache. I'm currently in a great relationship, but am really struggling with the past now. Any advice on how to handle this situation?