Fighting the urge

My ex and I broke up on Saturday because he had been talking to a girl, contacting her and attempting to see her. I called him a cheater and a piece of shit and blocked him. I cannot get my mind off the situation, I am still in love with him and wish none of that happened. I am staying strong and avoiding texting him or reaching out to him. 2 days ago he texted me asking for his hoodie back I gave it to his friend and didn’t respond. I really need advice, should I text him and tell him I’m hurt and pour my feelings, is that dumb? Or should I continue ignoring him even though it’s killing me that we’d never talk again?