in the 13 minutes this post has gone live, Ive come to see that I am infact the AH. The honesty is appreciated. Insecurities aside, it's good to hear the perspective of outsiders because the people close to you dont tell you when youre being the AH!

First ever post but really need some advice on what to do!

My (F24) fiance (M28) and I recently went to a garden centre with some friends. My fiance's, let's call him M, ex girlfriend works at this garden centre, let's call her B. It is useful to note that they did not remain friends post breakup and haven't had much contact since apart from bumping into each other in a club one time. Whilst we were in the garden centre, we noticed that B was looking over and whispering things to her colleague. So my friend and I decide to go on either side of M and link arms with him to walk past her. As we go to link arms, M shrugs us both off and said "that's embarrassing". I noticed that B did hear this, we were near enough and he was loud enough to be heard.

We both got off him but after, I found myself getting upset and so I told him that it shouldn't be embarrassing to link arms with your fiance in front of an ex. He didn't reply to this, nor did he talk to me for the rest of the day. The next morning, I decided to initiate a conversation (even though I truly thought that it shouldve been up to him to approach it) and asked if he wanted to speak about what happened

Long story short, we ended up arguing for over an hour and did not reach a resolution. In my perspective, it should not be embarrassing to link arms with your current partner in front of your former partner. The fact that he was embarrassed tells me that he still cares what she thinks, and placed this in a higher importance than me. In the argument, I did say that if that had happened in any other setting, he would have been fine with it, he only has an issue because it happened in front of B, which he did not agree nor disagree with.

In M's perspective, the linking of arms was never an issue. The issue for M was the "show" that came with it. Now, I'm a pretty eccentric person. Perhaps I can admit to you that part of me did do it because she was there, but again, my behaviour would have been fine in any other setting, just not this one. M would like me to apologise to him for my actions but I dont see the issue. I would like M to apologise for placing his ex above me in that moment, but he says it was more about how he was feeling than about her.

We have not spoken to each other in 2 days since the argument. We eat, sleep and exist in separate rooms. We're both pretty stubborn people so I can't see either of us breaking and apologising but I'm not sure on what to do at this point.

Any advice? AITA here?