I'm sure I love you very much, but I'm not sure whether you love me.
I am quite sure that I'm deeply in love with you, but I'm not sure whether/if you are in love with me.
im sure that i love you , but im sure whether u feel the same about me
I am certain that I love you very much ,but I am not sure whether you feel the same like me /but I am not sure whether you love me,too.
I am sure I am love you very much.But I can't make sure if you love me.
I can make sure that I love you very much
But I can't make sure whether you love me