I love d guy, he loves me to.. but d problem is that he has ego. or attitute i dont know how to tackle him.?

i know him from past 6 yrs. he love me alot n we have future plans also. but he doest feel that he is hurtg me by have'g attite n ego. if he is upset from me.. (wdout any reason) he dint talk'd to me for 18 days. n wen i asked him... he jus said sorry. wat to do please help me.