What does it mean when a woman says that she had great contact with a specific guy but he then disappeared?

I have a crush on a woman I 'm dating since 2 months ago. She knows I like her because I have told her. She acts hard to get, but she shows signs of reciprocating my feelings, although we have had no sex yet. Yesterday we were talking about the promotion at work of a friend of mine and then she told me that she "used to have great communication with him last year, during a couple of months, but then he suddenly disappeared". That guy is very promiscuous. Does it mean 1) that they had sex and he then left her or 2) that she played hard to get, like with me, and he stopped showing interest?

I don't want to ask her, because I don't know how, without seeming invasive.

What does it mean when a woman says that she had great contact with a specific guy but he then disappeared?
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