Can’t seem to get over my ex

I (24F) am looking for a book I can relate to that might cheer me up. I’m kinda devastated. The man who I thought was the love of my life just had a baby with his gf of 5 months. Perhaps a book where the central theme is more self-love and not about moving on to another relationship. Post college, starting “adulting”, also preferable.

Thanks in advance 🙂