i am alone and thinking

Today is another duty day,i am thinking about one person.He was very proud of himself when we last meet.I heard he told bad things about me, but today, i heard he is praising me.It is difficult to understand him.
He never did anything bad to me, but i keep my distance from him.I even told other people that i don't like him.
Actually i didn't know him well.Now the more i meet him, the more i feel i don't understand him at all.
He seem very unhappy lately and i know he wants to talk to me but daren't to call me first.
But i don't know what can I do for him.