I'll throw in a different opinion that might shed light on the situation for you:
You badgered him into revealing personal information you knew he didn't want to reveal.
Eventually you defeated him and he gave you that information.
You then gave it to other people. Without his consent. Against his will as well, since you knew he didn't want that information revealed.
You'll probably be thinking that you're not in the wrong because the information isn't important. I can think of 3 problems with that counter-argument:
1) The information isn't the only issue. There's also, perhaps more importantly, the issue of consent. Or, more accurately, the lack of consent.
2) The information might not be important to you, but it obviously is to him and you know that. It's fine for a person to choose to reveal information about themself as they please. It's not fine to do it to someone else against their will. Making a choice for yourself is very different to making that choice for someone else, especially if you know that your choice is the opposite of theirs and you're imposing your choice on them.
3) If the information isn't important to you, why did you go to such lengths to obtain it? ("You have no idea how hard it was to get this information.") Either the information was important to you (which nullifies the whole "not important information" argument) or bending him to your will was important to you (which is much worse than revealing personal information).
If you still don't understand his position, try this thought experiment:
Think of some personal information about yourself that you would not want spread about. Something not directly harmful to you, but something you want to keep private or known only to a certain circle of people. It could be anything - an odd but harmless sexual preference, an unfashionable liking for 1950s musicals, whatever.
Imagine that someone badgered you into revealing that information to you.
Imagine that they then told other people.
Imagine that they didn't even understand what they'd done wrong because they genuinely didn't care about your choices for yourself and so saw it only in terms of their own choices - if they don't mind the information being spread, then they don't see anything wrong in the information being spread.
It's probably best to leave it alone and find other friends, but it would be polite to tell them that you won't ignore their lack of consent and give out that information to other people in the future. I'll assume you didn't do so in the OP for this thread and instead gave a fake name for them.