Cucked in a love triangle [humiliation]

Long story short, with some modifications to ensure anonymity of all parties. I was in love with a woman I dated briefly some ten years ago. She ended it with me and went back to her ex. We realized with time we loved each other and one night I texted her on Snapchat. She confessed she was laying in bed with her lover asleep but was thinking of me being there. I was beyond jealous of the situation. It should have been me.
Well, eventually we got back together and started dating. With time I slowly realized I was into cuckolding. She’s the most beautiful woman I laid my eyes on. The most sensual, erotic, seductive woman I’ve ever encountered. I kept thinking of her getting fucked in front of me, with her moans in my face.
She had told me she never had sex with her ex once she realized she loved me. He was nonexistent in our lives as a couple. Well the other day – after years of being together and establishing trust – she humiliated me. She said she knew I was a cuckboy. (I shared many threesome porno scenes with her, and called myself her proud cuck.) but she told me her ex fucked her so good the night I texted her. His cum was in her as she texted me that night we got back in touch. Jesus, she even said his dick was bigger. I enjoyed every minute of it. This is a man I competed with for fucking years. And all I can think of is sharing her with him now.
I want to telll her I want to serve her and him.. but I’m enjoying her leading the way of humiliation. She even said I could never be a dom daddy like he could