Looking for book to teach me to forgive myself and find inner peace

So some context because that might help people with recommending me a good book for these specific feelings I am experiencing. I am a young sensitive autistic man and a hopeless romantic. I started working at the same company as my brother, and was put on a team with a girl I have a very intense infatuation for, or limerence for those who have experienced unrequited love. Of course it could not work out for numerous reasons (she's my co-worker, 8 years older than me, has a fiance, and if she was available are personalities might not be the most compatible), but I didn't care. Physically and demeanor wise she was exactly what I envisioned my future soulmate to be and I became obsessed with her. I tired to interact with her more but was constantly worried if I was over stepping my bounds. Eventually, I told our other co worker who is her friend about my infatuation and she seemed very understanding and supportive of my feelings. She was confused why I was telling her but it was because I thought she would tell the other girl and let her know that I had an innocent infatuation with her friend. Of course it wasn't innocent but I had no intention of having a more significant relationship with her, I just wanted her to like me back the same way she did with our other male co workers who she seemed to like more then me.

Afterwards they tried to completely avoid me, and while they stopped after they noticed this hurt my feelings, I have been unable to recover any friendliness that we once had between us. They now want me to stop talking them and I have never been more hurt emotionally and so consistently in my life. I will leave them alone now, I just feel so unlovable and hated, even though numerous of our other co workers seem to really like and enjoy my company. But for some reason these two girls who want nothing to do with me are really hurting me, but thats because I am allowing them to. I am so confused, I just want to move on, forgive myself, and stop focusing on these people who hate me. I want a book focused on finding inner peace, forgiving yourself and those you have conflict with. I want a book about redemption. I want a book about finding and falling in love with somebody who actually appreciates you. I also want a book about rekindling some form of religious faith as well, because I having been thinking more about my christian beliefs more recently as a lapsed catholic. I know this is a lot but I just want to read something that makes me feel understood and will allow me to improve myself.