what should i do??

i am in a relationship for 2 years. recently i got a job out of town 1800 kms far away. my boyfriend was supported in begining..but within 3 weeks from my moving out of the city he started getting irritated. this caused many fights and he started to say he doesnt believe in long distance realtionship.since the past 1 month i am trying to make him understand but he is getting me all wrong.now he has started to say he doesnt love me anymore. there is no-one else in his life. but still he wants to leave me. what should i do to make him understand? i cant live without him. more than my boyfrirnd he is my best friend. me need him and his support.
please guide me!