Lupin's resentment

[Anna]

No: HPFGUIDX 93740

In OoP, when Harry breaks into Umbridge's office to talk to Sirius 
about what he had seen in the pensieve, Lupin  says:

"Harry, there is nothing so important as you learning Occulemency!" 
said Lupin sternly.  Do you understand me?  Nothing!" 

When I reread  OoP, reading that line made me wonder if, on a 
subconscious level,  Lupin  harbors any resentment toward Harry 
because Harry's failure to learn Occulemency ultimately lead to 
Sirius' death.  Sirius was the last remaining tie to his days at 
Hogwarts, which (as we learn in PoA) were the best times of his 
life.  Losing Sirius must have devastated Lupin. 

Sorry if this has already been discussed.  If it has, can someone 
tell me where I can find it.  I did a search, but came up with 
nothing.

Thanks, Anna.