we ourselves mostly left and we barely realized it. but that's ok. i mean that's how we play in our job, work, bread and butter ( watever you wanna call it), its impossible to conceived a friends for keeps in work environment, so don't feel to dire and all that drama shit when you or someone have to leave, people come and go, we meet new friends, someone you spend 8 hours or more in a day, someone you booze party with, some one you shared getting lungs damage, someone you sip coffee with at Starbucks and shared office intrigues. then resign and leave them, then move to a different company , start learning new task, start of meeting new friends (oh.. not just meeting new friends, its picking up who's cool to chill with).. then start all over again putting much effort in blending in, discovering new coffee blends, starts making new office intrigues, then without us noticing that were forgetting the old ones, but we don't do it intentionally , its a cycle that juts happens that we have to deal with and get use to it, that's how it works...