Are you seeing a therapist?

If so, ask them if you could bring your boyfriend in for a few sessions and/or provide you with some educational materials to give him.

The only advice I can offer is to not allow someone who doesn't understand (regardless of their relation to you) to minimize your condition or force you to do things that you don't want to do because that will only serve to traumatize you more and delay your recovery process.

Sincerely,
Pfrog!