AITAH I might have caused a friend to lose their GF

So I went out with friends last night as the sober one and quite a few things went pretty bad.

One of them being that one friend’s brother ( David) was very drunk, and ended up seeing an ex that he had ghosted. I’m not exactly sure what had transpired as they were talking bc I was trying to round everyone up, but I saw them holding each other for what seemed like multiple minutes.

David had a girlfriend who was also in attendance that night, came over from outside and saw them embracing, and decided she did not want to ride back home with them ( they had another sober driver who was going to take them together) and instead asked if I could take her home, so I did.

By the time we were leaving the entire friend group had heard of what happened and was mad at David. They didn’t seem to understand what the issues was and why their GF didn’t want to ride with them but another issues broke out so we weren’t able to focus on it.

Here’s where I might be the AH: I told this GF, who I had never met before, that I think what David did was fucked up. She was of course very disappointed but tried her best the entire night to not show how much it hurt. I let her know that I didn’t agree with what he did at all and that if it was me I would be very hurt by it.

I was being honest, but I think looking back that I might have provided harmful input to a situation that wasn’t mine. But I never said that he was a bad person or that he is malicious. I don’t think he is, I just thought that moment was entirely fucked up. Embracing your ex while your current gf is with you, at a bar, that she didn’t know was there or that they even had a connection in the past, feels shitty to me.

But I drop off my friend at David’s house, and we see him crying on the phone with is GF. Long story short she breaks up with him, but he states that the most painful part was feeling like his friends were turning on him. His GF mentioned what I said to him and it kind of feels like I maybe pushed my opinion into their situation and it caused her to leave him. I don’t know how to feel about it.