What are signs of insecurity?

My boyfriend often doesnt really like me to wear short shorts or real showy clothes bc guys always look at me. He deals with it but its jusy my style. Now im not showing half my ass or anything but when its hot ill wear like a crop top or something with shorts. Im not trying to brag or anything but guys will always be checking me out no matter what i wear. I feel like im being blamed for being pretty when my boyfriend says the stuff i wear is too much and guys are just going to be looking. Is he insecure and think im going to get another guys attention and go to them or what i dont know why it is thag guys think this way.