Some Lupin questions

[greatlit2003]

No: HPFGUIDX 58856

Why didn't Lupin stay in contact with Harry after he left Hogwarts? 
Lupin would have been in a better position than Sirius to advise 
Harry when he was entered into the Triwizard Tournament. Does 
Lupin's strange behavior bother anyone else?

I was bothered by Black and Lupin's incredibly Muggle way of 
transporting Pettigrew at the end of PoA. Why didn't they do to him 
what Hermione did to Rita Skeeter at the end of GoF? Do wizards not 
rationalize, or should their behavior be attributed to the trauma of 
the evening?

If Lupin was part of the "old crowd" as Dumbledore says at the end 
of GoF, then why did Sirius and James suspect him to be the spy? 
Does that suggest that they also suspected everyone else in the "old 
crowd" (including Dumbledore perhaps) to be working against them?

greatlit2003, who loves Lupin and hopes Pettigrew doesn't kill him...