Broke her heart after she farted in face while I was "down under"

I was dating a single mom years ago. We had been together for about 1.5 yrs. One night we were in the sack, I went down on her and just as she was getting off, she let one rip. Right in my face. It was loud and I could almost taste it. Furthermore the blanket and the legs held me in for a min, kind of amplified the misery. Never been that close to an ass (while it was farting). We laughed it off and I casually drifted back up pretending not to care. I didn't immediately break up with her, it was a slow decay over a period of weeks. I couldn't get the fart situation out of my head. It was haunting. I even forced myself to go down on her (briefly) a couple more times before the split. She was the nicest, sweetest, most empathic human I've ever met. The reason I gave for breaking up with her was "that I thought I was potentially gay". My older brother is gay and thinking of his pain & struggles through life (while explaining this to her) gave me the tears necessary to make the narrative more convincing. I broke her heart. I really hurt that girl. My guilt is still tremendous. Furthermore I know she eventually cyber stalked me a couple years later and seen the new gf on fb. I'm assuming because I seen her "tracks" on one of my tiktok profiles. To this day I wonder if she knows the real reason.