what should I do

I'm 13 and am in love with this guy. In 5th grade he was in my class and I had a crush on him but the he moved. 3 years later and now he's back, and I truly love him and could see the rest of my life with him. He told me twice that he had mad feelings for me, should I tell him I like him. I'm really nervous and don't know what to do.