Someone elses boy

I mustnâ??t say I love you,
For youâ??re someone elseâ??s boy.
I mustnâ??t long too hold you,
For youâ??re someone elseâ??s joy.
I mustnâ??t let my eyes light up when someone calls youâ??re name,
For youâ??re someone elseâ??s boyfriend,
But I still love you all the same