I've been married 27 years. I have bipolar disorder (mostly manias), seizures & OCD. The OCD is pretty under control via xanax (the only thing that calmed it down)
Sometimes, I am the "therapist" in the relationship. He gets down about his job & goes on & on about that to me. Other times, he listens. It's good to share but it's also good to have whatever condition it is in balance. We can't be cured (Yet, science is working on better treatments) but we can see our therapists/pdocs & be sure to get onto good meds that work for us. Exercise helps, eating right helps, having other friends (I am a loner so I joined some writing groups & the other members are my "friends") is good. Avoiding things like alchol (other than once in a while) is healthy.
So don't worry too much about telling your BF how you are feeling. People w/out any sort of brain disorder do that, too