My ex and I dated for almost 3 years. His mom adored me and would make me gifts, bake for me, and treat me like family. After he cheated, I boxed up everything cards, letters, even a bracelet his mom made me and tossed it all. His mom messaged me, heartbroken, saying she thought I loved her like a second mom. I told her I can't hold onto pieces of someone who broke me. AITA?