AIO for thinking this is a normal group photo pose?

I (23M) went to a meet and greet to see some members of a YouTube channel called Donut Media. I went to this meet and greet alone even though I did invite my SO (24F) which was busy during the event, but she said it was okay to go without her. She asked how the event went and I sent her this photo not really thinking much of it, like I had about 30 seconds to take a photo and get some signatures on a poster so with that limited time I didn’t really pre-plan ahead how I was going to pose. I’m naturally a kind of awkward person and so I defaulted to just having my arm around everyone’s shoulder.

Anyways, my SO ghosted me out of anger/sadness and said that I was basically crossing the line by putting my arm around the lady to the left of me (I am wearing the blue shirt) and the pose they were in (leaning towards me)

I managed to discuss it with her after her ghosting stopped and she expressed that if the roles were reversed that I’d also be upset but in reality I’d be happy for her if she got to meet someone that she supports. I don’t have attractions towards anyone and I don’t have anything to hide.

It’s not like I put my arm around their waist or anything like that, my left arm is blocked by another arm going across everyone’s shoulder.

Ask away if you have questions but, am I over reacting by saying this is normal and defending myself or am I in the wrong for this?