boyfriend trubl help.......?

i know my guy loves me he always does every thing for me with out me asking him he moved 15thousend miles gust to be with me after my dad sent me to live with my mom we have always bin with around eachother every day he gets me things helps me out and then his adituded gust changes like that on me and yells at me and then when he cools down he ses he loves me and i mean the world to him i love him so much and i just dont know what to do anymore