If a secretive guy shares personal life details with you, does that mean he has feelings for you? Or you're just trustworthy?

TechieMatera
The title pretty much states it all. I've been friends (off and on) with this particular guy for about four years now, and he's always been heavily secretive and hardly shows any emotions and doesn't talk about his personal life. We've had flings off and on and I had hoped it would turn into something more, but it never did because he was so emotionally vacant. He's stated many times in the past that he's a "textbook Scorpio," which usually doesn't mean much to me since my sign (Gemini) is nothing like me.

Anyway, earlier this week he invited me over to his house for a work-related discussion (as we are now co-workers and have been for a few months) and as we were talking, he eventually asked me how I was doing since I'd been rather down the past few days. I told him what was going on, and shortly thereafter he willingly volunteered personal information about his past love life, fears he's had, among many other things (things I won't go into detail about to respect the trust he's obviously shown me), so does this mean something? He's acted fairly impassive ever since then (as he usually does), but I can't help but think about that one day where he was just so honest and open with me. I really liked it.

Is this a good sign, or could it just mean nothing? We were drinking at the time, but not too heavily, so it's not like he was drunk and incapable of controlling his actions. (He typically drinks far more than he did that evening, and has never volunteered personal information like that before.)
If a secretive guy shares personal life details with you, does that mean he has feelings for you? Or you're just trustworthy?
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