Do you cohabitate?

Are you dating or married?

See weather or not to share some things with him can depend on a wide variety of factors...factors only you know where and who you stand upon them.

Myself...meh, I dont do blogs, though I will share my thoughts on a forums, and as for diaries and writting assignments...well its better imho to just talk to him directly, but thats me.

Ultimately your the one who must decide for yourself how much if anything to share, or not with another.