Is this ual ualt? Or what is this?

My brother luke (21) has just come back from kuwait again. And now before this which was a few months ago, he had a big party to celebrate for earning the title of a United States Marine. During the party I had just stepped out of the bathroom from taking a shower wearing only my bra and underwear and one of his other marine friends stepped in and started telling me explicit things like c'mon what are you waiting for? Or let's make out, after this he apologized n said that he din't know what he was doing and that he was drunk. He stopped for a,little while and began doung it again while he was "undrunk". He keeps staring at me in my bathing suit, he says that I have a nice body, he even wanted me to come over his house. Dis you know that? Anyways, I am only 11 and this is really, freaking me out, is this called ual ualt? Or is this something else. He also tried driving me into the "corner" if you know what i'm talking about, should I tell my older brother about this? Because he even once told me that nobody messes with his little sister, should I tell him first, or just forget about him and call the cops right a way?