My partner's gender confusion

I have posted on this website already and have received some valuable feedback... which has led me to open up a little more and see what other have to say regarding another issue in my relationship. My boyfriend who is now almost 30 used to dress up as a woman. He claims he did it for "fun and attention", however I have found his blog where he writes he's always felt more like a woman than a man. When I confronted him, he said that's all in the past and he has accepted the fact that he is a man. What confuses me is that had I not found out about it, I would never suspect him of this (our intimate life is ok and I've never seen him dress up or wear make up). However, I do know he had done it for many many years, since he was a child and got in trouble for it. He dressed up as a teenager and young adult. He says he stopped doing it about 3 years ago. He says he's past that but can I really believe him? If he did it for so many years, I don't think it was just a phase. I don't think you can just get over something so deeply embedded in your brain. Just like you can't become straight when you're homosexual... or is this different? He's very sensitive and gentle but I don't know if that is proof enough that he really is a woman on the inside. I just don't want him to "change his mind" sometime down the road after devoting much of my time to this relationship. I am curious to see what other people think of this.

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