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I think he still did feel something for Lupin as an adult, since he risks blowing his cover trying to save Lupin during the broomstick chase from the Dursleys', as Hwyla pointed out above. It has to be something more than just protecting a colleague, since he stood by and allowed Charity Burbage to be killed. What, one might wonder, makes Lupin so special?
I think the difference between Charity and Remus' cases weren't the people but the situation. With Charity he was sitting on Voldemort's right side, at a table surrounded by 40some DEs. There was no way he could pull it off. During the 7-P battle there were 7 separate mini-battles taking place at once, so there were probably no more than 3-4 other DEs in the vicinity and everyone was moving so had he hit the DE as intended he could claim it was accidental.
I think the difference between Charity and Remus' cases weren't the people but the situation. With Charity he was sitting on Voldemort's right side, at a table surrounded by 40some DEs. There was no way he could pull it off. During the 7-P battle there were 7 separate mini-battles taking place at once, so there were probably no more than 3-4 other DEs in the vicinity and everyone was moving so had he hit the DE as intended he could claim it was accidental.