<human>: Long story short, about 4 months ago I cheated on my wonderful, amazing boyfriend and I finally got together the courage to tell him. As expected, he's hurting beyond measure, and his pain is hurting me. 

I've identified as poly almost my whole dating life. I've cheated on every boyfriend I've ever had. I never felt remorse from it. But now, this remorse is destroying every fiber of my being. I know I've truly changed from this experience, and I'm fighting so hard to make sure he knows it too. Unfortunately, he has no trust in me anymore, which is understandable, and even though he WANTS to give me a chance, he's thinking about rebuilding his life without me as a part of it. 

Reddit, you can call me every name in the book. I own it all. But please, please above all: how can I convince him that I've truly changed and I'm ready to fulfill every single promise I've made to him since the reveal? I'm terrified. I can't eat. I can't sleep. I'm physically sick to my stomach at the thought of what I've done and the thought of losing him. I can't go back in time and change what I did; there's no point in letting me know that I "shouldn't have done it in the first place." But if there's any chance I can right my wrongs going forward, I'll give up anything to make it happen.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Cheated on my boyfriend. Have offered everything in the world to make it right. Please help me find ways to offer beyond everything.