What would you do in this situation?

I had a destination wedding so not any people were able to make it from my side. One of my friends who was a bridesmaid came with her boyfriend. Everything was fine until the evening, my friend came up to me upset and pissed off saying one of my husband’s groomsmen’s girlfriend was flirting with her boyfriend and being inappropriate with him. I felt bad for my friend because she didn’t know anyone there apart from myself and her boyfriend. I told my husband and he was very confused because he’s known the girl for years through his best friend and that did not sound like her at all. My husband told me not to get involved because something doesn’t seem right about what my friend was saying so I left it alone. Long story short my friend left the wedding early because her boyfriend wasn’t feeling well. For the rest of the evening the girl was an absolute angel and getting me drinks and chatting to me and didn’t mention anything to me. 3 years later…. My husband is at working and was looking at our wedding pictures as he needed to advertise something they did at our wedding on his work social media. He sent the pictures to the girl who does the social media and in the corner of the picture was my friend with her boyfriend and the girl who dose the Social media, also came to our wedding said to my husband “omg that guy was such a creep at the wedding”. My husband looked at her confused and ask what she was on about. She then said “when you guys went to do your group pictures, he was stood with GM’s girlfriend and he kept making a lot of creep comments towards her and was being really pushy about wanted to get her contacts and he went as far as saying to her.. just add me on Snapchat because my girlfriend checks my phone and she won’t see that” and then she goes on to tell my husband that the whole time, the girl was just stood there just waiting for her boyfriend and was trying to politely say no thank you but he was being very pushy and that she felt sorry for her because she seems like a sweet girl”. I’m completely shocked by what I found out because that wasn’t the story my friend’s boyfriend told her and my friend’s boyfriend made it out that it was the girl that was trying it on with him and that he wasn’t interested. I don’t know what to do as I’m only finding out about this 3 years later and I’ve moved away so I don’t know what state their relationship is in and I only speaks to her on the odd occasion when we have some exciting news to share.