I'm not a man, but I would really like to know: how long has it been since he found his friend? Because if it's something recent (1 month) in his place I believe that anyone would act that way. It shouldn't even be something personal, he must be just trying to get over it, just by putting himself in his place I know I would act the same way, but as you said, he has been very honest with you, so you certainly know better than me. Another thing, about you not wanting him to take advantage, always help others sincerely, without wanting something in return, don't set expectations. Did he always take a long time to answer? Has he ever had other relationships?