I'm not really clear on how intimate your prior friendship was with him, but in any case, I'd stay open to him, but not hang out with him.
In other words, be friendly, say "hey" when you see him, but let him initiate any conversation or activities rather than you. In situations where you run into the two of them together, say at a party, acknowledge him with a knowing "what can you do look?" and the girlfriends unpredictable behavior can become your shared little joke.
Otherwise, steer clear and give them room.
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Building an artificial intelligence that appreciates Mozart is easy. Building an A.I. that appreciates a theme restaurant is the real challenge - Kit Roebuck - Nine Planets Without Intelligent Life
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