Is it normal that i cry all day long

i'm in a longdistance relationship.we have been loving each other since many years but we recently started to date.soon after that he went to another country where he studies and warned me in advance that may be we will talk less than we do now because i will be very busy there.now we talk everyday but mostly via msn.i know he loves me and i love him but still it irritates me that why do we talk less than before.and that makes me cry and be unhappy and insecure all day long.i don't know how many time i can continue in this way.i can't cry all day long.but at the same time i don't want to leave him.am i normal?or my tears are in waste?