Honestly, his biggest betrayal of Asuna wasn’t with Suguha it was with Alice irl. With Suguha, yeah, he agreed to bathe together, but I doubt he expected her to go that far even if he didn’t resist. But with Alice, it was a different story: he consciously agreed to it on his own.
If we're talking about Fog, then yeah, Sinon’s definitely the main one there. But personally, I rank Fog lower than irl events for me, the stuff that happens irl carries way more weight.