The blog post is here, for future readers, and should be required reading for every woman.
As to your question, of course it is OK!
People have secrets, and that is just fine. They also have a past which has made them who they are. You are going to want to talk about your past at some stage - and you totally should.
When you are comfortable with it.
A lot of the time, people seem to feel that a relationship comes with the right to know every last detail of your partner's background and past. It does not. That idea is total and unmitigated prairie oysters.
You tell what you are comfortable with, when you are comfortable with it. Your call. Not mine, not the President's, not the Pope's. Not his.
And not because you feeling obligated, or feeling that full disclosure is vital. Because you wish to is the only reason you need. Eventually, you will wish to speak out.
You will know when it is the right time. Yes, you will still be scared. Ain't no getting round that.
You do what is right for you.
PS - to the lady who's boyfriend slept with her mom. Drop me your email in a question please, if you wish. Got some interest from a large magazine that wahts to talk to you.
It might just be me, but when I read the question, I thought she was trying to ask if talking to a guy about your problems immediately makes him just an emotional tampon, or if it's okay to do this with a real boyfriend too.