Is this really something to be mad about?

Su

My boyfriend and I got into a fight yesterday because I posted this picture on snapchat. He said the neckline is too deep but I don't think it is. He logged in to my sc and removed it right away. I'm so mad rn. He's being so protective over something that doesn't even seem like a problem. What do you guys think?

Here's a picture of my full outfit. I literally don't find anything indecent about it