IME, sometimes it's a good idea to go back to counseling for a "tuneup." You're already aware of your issues; you have the tools to deal with them; you've grown as a person. Things can still resurface and disrupt our lives, and it can help to work through these with a counselor. You already did the hard part 8 years ago.

I would also consider asking your boyfriend to consider couples counseling with you, if you both want this to work. You are not in this relationship by yourself. It might help your relationship to grow if you work with a counselor to explore together what triggered this incident, how it affects both of you, and what you can do to be more supportive of each other.