I'm 100% positive I'm the reason why my friend is divorced, and it bugs me everyday

No details will be given to protect everyone's identity, but I just need to get this off my chest because it haunts me constantly. I would say I'm 100% sure it's my fault that my friend of 20+ years got divorced. It's been years since and we are still good friends, and I just want him to be happy more than anything. He knows the story I'm about to tell, but not to the extent that I'm taking it.<br><br>He got married in his mid 30s and I was one of his groomsmen. The night before the wedding, he wanted to go out to a bar with "just the guys" to have a last drink / hangout before he got married. He had a lot of people in his wedding party and there were a couple people he didn't want there because he thought they'd drink too much and ruin his wedding. I agreed, and we went to the bar, and had a great time. He had a couple of drinks, but not too many because of the "big day" ahead of him.<br><br>I think this is where I fucked up. Looking back, I probably should have included these 2 people in the outing because I believed they would get drunk and cause issues, when in reality they probably wouldn't have. Anyways, the next day at the wedding, one of those two people showed up very very drunk already, and they completely ruined the wedding for him. They were extremely loud, obnoxious, and their antics in front of his bride and groom's family were unacceptable. I remember him crying in the bathroom after the ceremony and before the reception.<br><br>They ended up divorced a few years later, and I often wonder if that wedding turned her off from the marriage / him in general. I know this is probably just confirmation bias, but almost every time I saw them together after that, she looked pissed / irritated at him for no reason in particular. I can't help but think "what if". What if I would have let those two tag along the night before? What if that person didn't show up drunk to the wedding? What if the wedding went smoothly?<br><br>I just want him to be happy. He doesn't blame me for any of this, but I can't stop thinking about it.