Should I have told him?

You've taken a huge step.. you're involving your boyfriend in the healing process and that takes an incredible amount of trust. I think as long as your boyfriend is a good guy, you've made a good choice to move forward with your issues. I hope he understands how much trust you're putting in him. Anyways, you feel vulnerable, because, possibly, for the first time you've let one of your defenses/guards down. And now, someone is inside that, and it's always a little scary. You have to deal with it though, this is a very natural reaction when dealing with past issues that you've bottled up. Honestly, a good cry might be helpful in this situation, although I can understand not wanting to do it on camera.