Why does my boyfriend not tell me things like when my yoga pants are see through?

Anonymous
I got a new pair of yoga pants for Christmas and wore them for the first time today. My boyfriend and I went to the gym this morning and after that we went to a couple of stores and then met up with some friends for lunch. We hung out with the friends for a while after lunch and while we were at a shoe store my girlfriend came up to me and asked me if I knew that you could see my thongs through my yoga pants. I told her no and then made a trip to the bathroom where I turned around and looked in the mirror and you could see my bright red thongs plain as day through my pants and when I bent over you could actually see my bare butt because my pants material stretched so much. I went and asked my boyfriend if he knew that my thongs were showing and he said yes he had been checking them out all day. I asked him why he didn't tell me and told him that I was embarrassed walking around like that. He told me he didn't think it was that big a deal and that see-through is kind of in style and he sees it all the time on other girls. I punched him in the stomach for saying that and told him I needed to go home and change. We went home and I got to thinking about how they were completely see-through when I bend over and how I have been bending over all day working out at the gym, trying on shoes, and who knows else when.

Why would my boyfriend not let me know this? Why does he think that this is style? I know it is somewhat my fault for not checking before I left the house but I did not even think that my pants would be see-through nor did I even pay attention that I was wearing bright red thongs. I hope people didn't think I was trying to be trashy.
Why does my boyfriend not tell me things like when my yoga pants are see through?
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