Please help me to get her back .. i love her :'( :'( i miss the way she used to love me.?

me n my girlfriend broke up cos she thinks i dont trust her and i m possessive, i really luve her :'( :'( now she likes someone else :'( she is not in relationship wid him but m very much fear to lose her forever :'( :'( please help me to get her back .. i love her :'( :'( i miss the way she used to love me.