My boyfriend is in kuwait, we have only been dating a month?

my boyfriend is in kuwait for construction, before he left he made some stupid decisions he lied to me and hid it behind my back when i asked. so we were dating for like a month, then he left but he keeps talking about getting married, i don't want to settle down right now. he is 25 yrs old and i am 19 yrs old, he says he loves me but i don't love him, but i don't know how to tell him. then on the other hand i have this really great guy who i've been friends with since before my boyfriend and he tells me his feelings about me, and it makes me so happy. i just don't know what to say to my boyfriend, that i don't want to be with him. how do i tell him? what do i do?