Crush that is 2 years older then me

So I have a problem , so I was walking around and found this guy and he is the most charming and hot person that you will instantly fall in love with , he has blue braces , blue eyes, blonde hair, really tall and very masculine. I instantly liked him, I think he knows because I stare at him way to much. Everytime I walk past him his mood changes from happy to silent and sad, and cant even look at me. He always hangs out with alot of girls, and says he has hoes. He always is hugging or cuddling a new girl daily. He started being different two days ago and I am wondering what happened? Before in Learning community or what you call home room, he always use to look at me and a few days ago we spoke and had a normal conversation. He is two years older then me and we are both in our teens.