First of all you must accept that you are bold as it needs courage to post something here. I am married to someone who has SA and I am with her more than 20 years. We practically have grown up together. Few tips i can tell you.
It is very very difficult for people to understand what is SA unless they have been told this with lot of examples and the complexity. After 20 years I have started understanding this better and I am still away from 100%. I know it is difficult for you to every time go and tell him how you feel. It affects your self esteem. Challenge here is not that he is not caring. Challenge here is that he has not been explained SA well. So please spend a dedicated time with him explaining him exactly how you feel. Plan a "SA Education" date. No one needs to change. Both of you need to talk more and automatically you will come to some middle ground. Don't let your relationship die because of the communication skill sets.
Secondly, I am assuming that you would have read Men are from mars and how we are wired or designed differently than women. Neither sex is wrong, It is genetic. Don't expect iOS to run on Android Phone. Once you will understand how men thinks, this will help you deal with him as well as other men better. We are typecast as EGO and that is true but it is not a bad thing as it has been projected by extreme feminist.
Focus on core values between your personalities and his personalities. If the basics are in place, work on your SA part with him. He will definitely understand gradually. 6 years a long time mate.
I am not sure if you are comfortable telling your near and dear ones that you have SA. I think you should. Remember the movie Beautiful Mind? In that movie last scene Russel Crow asks his student weather she can see the person who had come to invite him for the noble prize? Trust me having SA, any other depression related challenges, being gay etc etc is OK. There are enough matured and sensitive men and women who has respect for the diversity and they will help you grow. And those who dont have respect for it, in any case should not be part of your lives. Correct?
Why the above point is important? It is. There could be a very high chance that you would be unknowingly burdening your BF with all the expectations. It's a men thing. I can understand better. We feel suffocated. You having few more friends or people will ease out the bit of burden from him. Space is critical for men. Hope you give him enough. This will bounce him back to you friend.
Last and the most important advise. Accept yourselves with pride and respect. But pride should not be so high that you become rigid and so hard that you are all out to take everyone's case. Commit to the therapy rules and programes which will gradually help you come out of SA. And I am telling you. you will be fine. Just trust me even if you dont know me. No one can help you unless you decide to help yourselves.
take care god bless and all the best.