Why didn't Remus Lupin seek Harry out before PoA? And why didn't he reveal to Harry that he was friends with his father before Sirius came along?
"You heard James?" said Lupin in a strange voice.
"Yeah..." Face dry, Harry looked up. "Why -- you didn't know my dad, did you?"
"I -- I did, as a matter of fact," said Lupin. "We were friends at Hogwarts. Listen, Harry -- perhaps we should leave it here for tonight. This charm is ridiculously advanced...I shouldn't have suggested putting you through this..."
Why does he answer Harry's question dismissively and not give him more details? I would assume it was because he wants to avoid questions about Sirius at that point. And let's say Dumbledore stopped him from contacting Harry until he started school at Hogwarts, to keep him out of contact with the wizarding world and safe.
He could still have contacted Harry during his first two years at Hogwarts. Why didn't he, considering his closeness with James and Lily, and that he was the only thing close to a family connection that Harry had?