Broke up. Am I being petty?

This guy (30 years old) and I (26 years old) broke up today. Two weeks ago he surprised me with a set of pearl earrings. I have no idea if they are cheap or expensive. He also went to my sisters bridal shower and gifted her $100. Today we decided to break up. He is usually always moody and I feel like I have to walk on eggshells around him. So we both decided to call it quits. I don't want to kee the earrings. I want to return them. I also want to give him $100 out of my own pocket for the gift he gave my sister at her bridal shower. I wouldn't take it back from my sister,  of course not, so it would be out of my money. He hasn't asked for any of this, but in my heart, I feel like I need to. Am I being petty tho? It's just these are sort of big gifts and I don't feel right keeping them. Thoughts?? I would send all this in the mail.