Wow, that would infuriate me too! I would lean toward the stop telling him personal information so he doesn't have the opportunity to use it against you, use it for laughs, etc. When he proves he's mature enough to handle it, maybe you can consider letting him back in.

I don't konw why people act like that, especially about people that they care about. I think some people are just less sensitive, less attuned to other people's feelings than others. He should work on that though, because you've pointed it out to him and to continue it is quite inconsiderate. As you say, how can he be much of a partner to you if you have to hide personal information from him. Ugh. Good luck.