How Close Are Harry and Lupin?

[pippin_999]

No: HPFGUIDX 96688

I don't see Harry betrayed by someone he truly knows and loves. 
But how close is he to Lupin? Their relationship seems to me 
that of a brilliant teacher to a gifted pupil and little more, at
least on Harry's side.  Though Lupin appears to care about Harry 
very much, it's hard to tell if Harry reciprocates.  At the  beginning 
of GoF, Harry instinctively turns to Sirius when he needs advice 
about his scar, even though he's known Lupin much longer and 
Lupin is a DADA specialist. He doesn't even think of consulting 
Lupin. Except for the joint Christmas present with Sirius, they 
never write to each other at all,IIRC.

There's another thing that bothers me. In the Death Chamber, 
Lupin grabs Harry, holds on to him when Harry is viciously 
fighting to let go, keeps a grip on him even after Harry stops 
struggling. But when Bella drops Kingsley and flees "Harry had 
already wrenched himself from Lupin's slackened grip."  Why 
didn't Lupin hold on tightly enough to keep Harry from going after 
Bella? Didn't he realize that's what Harry would do?

Pippin