Reading chat logs from the past, is an enjoyment equivalent to looking at photographs. We may have forgotten, but we may remind ourselves. I think I look silly smiling to myself, laughing at those expired jokes in those conversations. Yet re-living those moments is priceless. There will be people whom you've grown closer to, and of course those that you don't talk to anymore. Then there're those whom you have always talked to, and those who're on your list for the sake of being there. The past is what we can't change and the future is what we can't predict. Hence we should stop looking back and be realistic. Live in the present and cherish the moment now...
And for a start, begin revision. T_T