if i want to say "mine" in arabic, can i say ليا ??
and what does فراقك mean in arabic ? :=)

Question

Answer

You can say لي it's better

Answer

فراقك: being far from you, being seperated by distance or other reason. It shows that the person is missing the other.

Mine in standard arabic  (fouss7a) is "لي " 
"ليا" is in dialect arabic of some countries

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miss means فراقك  like some one left you and there is missing
mine means لدي or ليا or الخاص لدي

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(your leaving)