Happens to me a lot.
I've not long since got rid of a flatmate (who still harasses me) who basically gave me orders for most of a year, tried to run my life, spread nasty rumours about me behind my back, stole from me, talked down to me and gave hour-long lectures about simple things, and generally made my life absolute hell. That was a situation that needed a lot of trust to go into, and she totally abused it straight off.
And when I was at university, people wanted to be around me - but only when there was work to be done. Since I graduated, nobody has stayed in touch. There was never a real social side to it beyond working lunches. The night before the very last exam, I had to unplug the phone to get any sleep - it was a pre-seen paper, which we'd had for five weeks (and the answers were all interpretative), and I kept getting calls - what time is the exam, where's the exam, and what's the answer?
I hate that. I really do. Sometimes people just suck.
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"Be uncomfortable; be sand, not oil, in the machinery of this world." - Günter Eich (1907-1972)