How should i forget him?

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was in love with a guy and after like 5years i come to know that he has been lieing to me.... lies which i can not take...i mean any girl wont....can plzzzzzzzzz any one help me how should i forget him??should i make friends talk n get involved again?i did made new freinds n stuff but deep inside i still love him and i want to forget him...i just dont know how should i???it has been like 2weeks since v broke up...man worse thing valentine is coming........Oh God!!!!!!!!!i know what will i do on that day:( how long will it take2 forget him?help me in forgeting this guy plz!!!!!!!!!!:(